[Frontend] Fixed HTML and CSS for grid-item

open #486
Normalized grid-item to use similar HTML structure
as label template;
Fixed CSS accordingly.

platform/commonUI/general/res/sass/_icons.scss

@@ -35,7 +35,6 @@
 	}
 	&.icon {
 		color: $colorKey;
-        //position: relative;
         font-size: inherit;
 		&.alert {
 			color: $colorAlert;
@@ -81,14 +80,11 @@
 }
 
 .t-item-icon {
-	// Used in grid-item.html, tree-item, inspector location, more?
+	// Used in grid-item.html, tree-item, inspector location
 	@extend .ui-symbol;
     @extend .icon;
     line-height: normal; // This is Ok for the symbolsfont
     position: relative;
-    .t-item-icon-glyph {
-        position: absolute;
-    }
     &.l-icon-link {
         .t-item-icon-glyph {
             &:before {
@@ -103,4 +99,4 @@
             }
         }
     }
-}
+}