support lower values for the icon margin

--the default is changed to 15%

containment/contents/config/main.xml

@@ -30,7 +30,7 @@
     </entry>
     <!-- this is percentage -->
     <entry name="iconMargin" type="Int">
-      <default>0</default>
+      <default>15</default>
     </entry>
     <entry name="shrinkThickMargins" type="Bool">
       <default>false</default>

containment/contents/ui/main.qml

@@ -155,9 +155,9 @@ DragDrop.DropArea {
     property int thickMarginOriginal: Math.ceil(0.12 * maxIconSize)
 
     //! iconMargin from configuration is a percentage. The calculation provides a length
-    //! for that value between 0.12 - 0.5 of iconSize, this way 100% iconMargin means
+    //! for that value between 0.04 - 0.5 of iconSize, this way 100% iconMargin means
     //! equal to the iconSize
-    property int iconMargin: Math.ceil( (0.12 + (0.38 * (plasmoid.configuration.iconMargin)/100)) * iconSize)
+    property int iconMargin: Math.ceil( (0.04 + (0.46 * (plasmoid.configuration.iconMargin)/100)) * iconSize)
     property int statesLineSize: latteApplet ?  Math.ceil( root.iconSize/13 ) : 0