fix(tabs): correct flex-basis

Author: Ryan A. Johnson

src/helix-ui/styles/elements/hx-tabcontent.less

@@ -3,7 +3,6 @@ hx-tabcontent {
   border-color: @gray-300 transparent;
   border-style: solid;
   border-width: 1px;
-  flex-basis: 14rem; // 224px
   flex-shrink: 0;
   min-height: 14rem; // 224px
   overflow: hidden;
@@ -14,9 +13,9 @@ hx-tabcontent {
   // as tabset grid cell
   -ms-grid-row: 2;
   -ms-grid-column: 1;
-  
+
   // as sub-grid container
-  display: -ms-grid;  
+  display: -ms-grid;
   -ms-grid-rows: 1fr;
   -ms-grid-columns: 1fr;
 }
@@ -27,5 +26,5 @@ hx-tabcontent {
     display: flex;
     flex-direction: column;
     flex-grow: 1;
-  }                                                                                                                 
+  }
 }