[AppLauncher] Fix icon size

src/qml/AppLauncher.qml

@@ -32,9 +32,9 @@ import QtQuick.Controls.Styles.Nemo 1.0
 
 GridView {
     id: gridview
-    cellWidth: parent.width/4
+    cellWidth: Math.min(parent.width,parent.height)/4
     cellHeight: cellWidth + 30
-    width: Math.floor(parent.width / cellWidth) * cellWidth
+    width: parent.width
     cacheBuffer: gridview.contentHeight
     property Item reorderItem
     property bool onUninstall