fix(schematics): nav schematic generates TSLint errors (#13268)

Fix no-trailing-whitespace errors

Author: Splaktar

src/lib/schematics/nav/files/__path__/__name@dasherize@if-flat__/__name@dasherize__.component.ts

@@ -22,7 +22,7 @@ export class <%= classify(name) %>Component {
     .pipe(
       map(result => result.matches)
     );
-    
+
   constructor(private breakpointObserver: BreakpointObserver) {}
-  
-  }
+
+}