[Frontend] Adjusted margin strategy in left pane elements

open #250
Changed flex-elem to use margin-bottom instead of top;
Added margin-top to .search-results element;

platform/commonUI/browse/res/templates/browse.html

@@ -31,7 +31,7 @@
                 <div class="abs holder l-flex-col holder-treeview-elements">
                     <mct-representation key="'create-button'"
                                         mct-object="navigatedObject"
-                                        class="flex-elem">
+                                        class="holder flex-elem create-btn-holder">
                     </mct-representation>
                     <mct-include key="'search'"
                                  ng-model="treeModel"