Update the curved mode on exiting fullscreen

Window view model's isCurved property was not properly updated when
exiting fullscreen. When entering fullscreen it's updated because
placeWindow() is called. However on unfullscreen placeWindow() is
not called so the isCurved property was not updated. The solution
is to call updateCurvedMode when entering/exiting fullscreen.

app/src/common/shared/com/igalia/wolvic/ui/widgets/Windows.java

@@ -1388,17 +1388,18 @@ public void onContentFullScreen(@NonNull WindowWidget aWindow, boolean aFullScre
             for (WindowWidget win: getCurrentWindows()) {
                 setWindowVisible(win, win == mFullscreenWindow);
             }
-            updateMaxWindowScales();
-            updateViews();
-        } else if (mFullscreenWindow != null) {
+        } else {
+            if (mFullscreenWindow == null)
+                return;
             aWindow.restoreBeforeFullscreenPlacement();
             mFullscreenWindow = null;
             for (WindowWidget win : getCurrentWindows()) {
                 setWindowVisible(win, true);
             }
-            updateMaxWindowScales();
-            updateViews();
         }
+        updateMaxWindowScales();
+        updateCurvedMode(true);
+
     }
 
     @Override