preview: add option to mirror preview on conference

And set default to true

Change-Id: Idc871c5d0497bc4d7e5c137795e9165ca987274d
GitLab: #1039

src/app/appsettingsmanager.h

@@ -58,7 +58,7 @@ extern const QString defaultDownloadPath;
     X(LANG, "SYSTEM") \
     X(PositionShareDuration, 15) \
     X(PositionShareLimit, true) \
-    X(FlipSelf, false)
+    X(FlipSelf, true)
 
 /*
  * A class to expose settings keys in both c++ and QML.

src/app/mainview/components/OngoingCallPage.qml

@@ -162,6 +162,7 @@ Rectangle {
                     if (button === Qt.RightButton) {
                         var isOnLocal = eventPoint.position.x >= previewRenderer.x && eventPoint.position.x <= previewRenderer.x + previewRenderer.width
                         isOnLocal &= eventPoint.position.y >= previewRenderer.y && eventPoint.position.y <= previewRenderer.y + previewRenderer.height
+                        isOnLocal |= participantsLayer.hoveredOverlaySinkId.indexOf("camera://") === 0
                         callOverlay.openCallViewContextMenuInPos(eventPoint.position.x,
                                                                  eventPoint.position.y,
                                                                  participantsLayer.hoveredOverlayUri,