refactor: improve pin icon styles in tab bar and working files

Author: devvaannsh

src/styles/Extn-TabBar.less

@@ -255,7 +255,7 @@
 }
 
 .tab-pin {
-    font-size: 0.75rem;
+    font-size: 0.625rem;
     padding: 0.1rem 0.4rem;
     margin-left: 0.25rem;
     color: #666;

src/styles/brackets.less

@@ -1445,10 +1445,10 @@ a, img {
 
     li.pinned .working-set-pin-icon {
         position: absolute;
-        right: 4px;
+        right: 10px;
         top: 50%;
         transform: translateY(-50%);
-        font-size: 10px;
+        font-size: 9px;
         color: @project-panel-text-2;
         opacity: 0.7;