iOS: Continue recording audio when phone sleeps (Fixes #6407)

ios/App/App/Info.plist

@@ -78,6 +78,10 @@
 			<string>ANY</string>
 		</dict>
 	</dict>
+	<key>UIBackgroundModes</key>
+	<array>
+		<string>audio</string>
+	</array>
 	<key>UILaunchStoryboardName</key>
 	<string>LaunchScreen</string>
 	<key>UIMainStoryboardFile</key>