calls: allow double click on call overlay to toggle fullscreen

- removes the single click to maximize feature

Change-Id: I6a171d2a20d5b47e9c3a15db23f2de01319d22bb

src/mainview/components/ParticipantOverlay.qml

@@ -186,7 +186,7 @@ Rectangle {
 
             anchors.fill: parent
             hoverEnabled: true
-            propagateComposedEvents: false
+            propagateComposedEvents: true
             acceptedButtons: Qt.LeftButton
 
             Image {
@@ -233,10 +233,6 @@ Rectangle {
                 }
             }
 
-            onClicked: {
-                CallAdapter.maximizeParticipant(uri)
-            }
-
             onEntered: {
                 if (contactImage.status === Image.Null) {
                     root.z = 2