fix: updated snapshot test

public/app/core/components/UserPicker/__snapshots__/UserPicker.jest.tsx.snap

@@ -5,7 +5,7 @@ exports[`UserPicker renders correctly 1`] = `
   className="user-picker"
 >
   <div
-    className="Select width-8 gf-form-input is-clearable is-loading is-searchable Select--single"
+    className="Select width-8 gf-form-input gf-form-input--form-dropdown is-clearable is-loading is-searchable Select--single"
     style={undefined}
   >
     <div
@@ -71,7 +71,7 @@ exports[`UserPicker renders correctly 1`] = `
               }
             }
           >
-
+            
           </div>
         </div>
       </span>