Add support for showing the native OS incoming call screen when starting new Element Calls

ElementX/SupportingFiles/Info.plist

@@ -80,8 +80,9 @@
 	</array>
 	<key>UIBackgroundModes</key>
 	<array>
-		<string>fetch</string>
 		<string>audio</string>
+		<string>fetch</string>
+		<string>processing</string>
 		<string>voip</string>
 	</array>
 	<key>UILaunchScreen</key>

ElementX/SupportingFiles/target.yml

@@ -90,8 +90,9 @@ targets:
         NSLocationWhenInUseUsageDescription: Grant location access so that $(APP_DISPLAY_NAME) can share your location.
         NSFaceIDUsageDescription: Face ID is used to access your app.
         UIBackgroundModes: [
-          fetch,
           audio,
+          fetch,
+          processing,
           voip
         ]
         BGTaskSchedulerPermittedIdentifiers: [