Simplify ConversationsDbusInterface

We have one ConversationsDbusInterface per plugin, and one plugin per device

So each interface is always bound to one device and we don't need to maintain an internal list

plugins/sms/conversationsdbusinterface.cpp

@@ -17,8 +17,6 @@
 
 #include "kdeconnect_conversations_debug.h"
 
-QMap<QString, ConversationsDbusInterface *> ConversationsDbusInterface::liveConversationInterfaces;
-
 ConversationsDbusInterface::ConversationsDbusInterface(KdeConnectPlugin *plugin)
     : QDBusAbstractAdaptor(const_cast<Device *>(plugin->device()))
     , m_device(plugin->device()->id())
@@ -26,17 +24,6 @@ ConversationsDbusInterface::ConversationsDbusInterface(KdeConnectPlugin *plugin)
     , m_smsInterface(m_device)
 {
     ConversationMessage::registerDbusType();
-
-    // Check for an existing interface for the same device
-    // If there is already an interface for this device, we can safely delete is since we have just replaced it
-    const auto &oldInterfaceItr = ConversationsDbusInterface::liveConversationInterfaces.find(m_device);
-    if (oldInterfaceItr != ConversationsDbusInterface::liveConversationInterfaces.end()) {
-        ConversationsDbusInterface *oldInterface = oldInterfaceItr.value();
-        oldInterface->deleteLater();
-        ConversationsDbusInterface::liveConversationInterfaces.erase(oldInterfaceItr);
-    }
-
-    ConversationsDbusInterface::liveConversationInterfaces[m_device] = this;
 }
 
 ConversationsDbusInterface::~ConversationsDbusInterface()
@@ -47,10 +34,6 @@ ConversationsDbusInterface::~ConversationsDbusInterface()
     conversationsWaitingForMessages.clear();
     waitingForMessages.wakeAll();
     waitingForMessagesLock.unlock();
-
-    // Erase this interface from the list of known interfaces
-    const auto myIterator = ConversationsDbusInterface::liveConversationInterfaces.find(m_device);
-    ConversationsDbusInterface::liveConversationInterfaces.erase(myIterator);
 }
 
 QVariantList ConversationsDbusInterface::activeConversations()