webview.qml: swap F11 and Shift+F11 in desktop mode for consistency

It appears this was a mistake. Now the shortcuts are consistent with
input.json, and with the shortcuts for MacOS.

Shift+F11 will always toggle fullscreen and not switch the mode (both in
TV and desktop mode). F11 will always toggle fullscreen and web mode,
like the UI button does.

src/ui/webview.qml

@@ -24,7 +24,7 @@ KonvergoWindow
     enabled: mainWindow.webDesktopMode
     shortcut: {
       if (components.system.isMacos) return "Ctrl+Shift+F";
-      return "Shift+F11";
+      return "F11";
     }
     onTriggered: mainWindow.toggleFullscreen()
   }
@@ -35,7 +35,7 @@ KonvergoWindow
     shortcut:
     {
       if (components.system.isMacos) return "Ctrl+Meta+F"
-      return "F11"
+      return "Shift+F11"
     }
     onTriggered: mainWindow.toggleFullscreenNoSwitch()
   }