Update search icon and avatar SVG (#345)

theme/blockly.less

@@ -142,6 +142,10 @@ span.blocklyTreeIcon.blocklyTreeIconadvancedexpanded::before {
     content: "\f114";
 }
 
+span.blocklyTreeIcon.blocklyTreeIconsearch::before {
+    content: "\f11a";
+}
+
 .save-editortools-btn .icon.save:before {
     font-family: 'legoIcons';
     content: "\f118";