[Frontend] Fixed CSS issue with Timeline label elements

open #659
CSS for .rep-object-label modified; Added CSS class
to tabular-swimlane-cols-tree.html markup;
Also cleaned up .s-status-pending styles for related
label elements;

platform/commonUI/general/res/sass/_object-label.scss

@@ -41,12 +41,9 @@ mct-representation {
             .t-item-icon {
                 &:before {
                     $spinBW: 4px;
-                    $spinD: 0;
                     @include spinner($spinBW);
                     content: "";
                     padding: 30%;
-                    width: $spinD;
-                    height: $spinD;
                 }
                 .t-item-icon-glyph {
                     display: none;
@@ -59,6 +56,7 @@ mct-representation {
         }
     }
 }
+
 .selected mct-representation.s-status-pending .t-object-label .t-item-icon:before {
     border-color: rgba($colorItemTreeSelectedFg, 0.25) !important;
     border-top-color: rgba($colorItemTreeSelectedFg, 1.0) !important;