Change the margin in the view orientation buttons to aling the pixels correctly

resources/qml/ViewOrientationButton.qml

@@ -11,5 +11,5 @@ UM.SimpleButton
     height: UM.Theme.getSize("small_button").height
     hoverColor: UM.Theme.getColor("small_button_text_hover")
     color: UM.Theme.getColor("small_button_text")
-    iconMargin: 0.5 * UM.Theme.getSize("wide_lining").width
+    iconMargin: UM.Theme.getSize("thick_lining").width
 }