Improve coding style

- Use latest QQC2 import
- Remove curvy brance from single statement block

Signed-off-by: Carl Schwan <carl@carlschwan.eu>

app/qml/DevicePage.qml

@@ -4,15 +4,14 @@
  * SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
  */
 
-import QtQuick 2.2
-import QtQuick.Controls 2.1
-import QtQuick.Layouts 1.1
+import QtQuick 2.15
+import QtQuick.Controls 2.15 as QQC2
+import QtQuick.Layouts 1.15
 import QtQuick.Dialogs 1.0
-import org.kde.kirigami 2.12 as Kirigami
+import org.kde.kirigami 2.20 as Kirigami
 import org.kde.kdeconnect 1.0
 
-Kirigami.ScrollablePage
-{
+Kirigami.ScrollablePage {
     id: root
     property QtObject currentDevice
     title: currentDevice.name
@@ -46,7 +45,6 @@ Kirigami.ScrollablePage
     ]
 
     ListView {
-
         model: plugins
         delegate: Kirigami.BasicListItem {
             label: name
@@ -57,8 +55,7 @@ Kirigami.ScrollablePage
             onClicked: onClick()
         }
 
-        property list<QtObject> plugins : [
-
+        property list<QtObject> plugins: [
             PluginItem {
                 name: i18nd("kdeconnect-app", "Multimedia control")
                 interfaceFactory: MprisDbusInterfaceFactory
@@ -127,24 +124,19 @@ Kirigami.ScrollablePage
             }
         }
 
-        Column {
-            visible: root.currentDevice.hasPairingRequests
-            anchors.centerIn: parent
-            spacing: Kirigami.Units.largeSpacing
-
         Kirigami.PlaceholderMessage {
             text: i18n("Pair requested")
-                anchors.horizontalCenter: parent.horizontalCenter
-            }
-
+            visible: root.currentDevice && root.currentDevice.hasPairingRequests
+            anchors.centerIn: parent
+            spacing: Kirigami.Units.largeSpacing
             RowLayout {
-                Button {
+                QQC2.Button {
                     text: i18nd("kdeconnect-app", "Accept")
                     icon.name:"dialog-ok"
                     onClicked: root.currentDevice.acceptPairing()
                 }
 
-                Button {
+                QQC2.Button {
                     text: i18nd("kdeconnect-app", "Reject")
                     icon.name:"dialog-cancel"
                     onClicked: root.currentDevice.rejectPairing()

app/qml/PluginInfoPage.qml

@@ -4,33 +4,27 @@
  * SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
  */
 
-import QtQuick 2.2
-import QtQuick.Controls 2.2
-import org.kde.kirigami 2.0 as Kirigami
+import QtQuick 2.15
+import org.kde.kirigami 2.20 as Kirigami
 
-Kirigami.Page
-{
+Kirigami.Page {
     id: root
     property string configFile
     property string device
 
     actions.main: loader.item.action
 
-    onConfigFileChanged: {
-        loader.setSource(configFile, {
+    onConfigFileChanged: loader.setSource(configFile, {
         device: root.device
     })
-    }
 
     Loader {
         anchors.fill: parent
         id: loader
-        Component.onCompleted: {
-            setSource(configFile, {
+        Component.onCompleted: setSource(configFile, {
             device: root.device
         })
     }
-    }
 }