chore(toolbar): combine imports from same file (#1753)

* Moves two separated imports to one single import statement.

Author: devversion

src/lib/toolbar/toolbar.ts

@@ -5,10 +5,10 @@ import {
   ChangeDetectionStrategy,
   Input,
   ViewEncapsulation,
-  Directive
+  Directive,
+  ElementRef,
+  Renderer
 } from '@angular/core';
-import {Renderer} from '@angular/core';
-import {ElementRef} from '@angular/core';
 
 @Directive({
   selector: 'md-toolbar-row'