chore(tests): use Array.forEach() instead Array.map()

When the `Array.map()` results are discarded, use `Array.forEach()`.

Google's internal TypeScript compiler that detects calls to well-known functions and methods that return a value that is discarded. So this pattern will become a compilation error soon.

Fixes #469.

Author: bowenni

src/lib/media-query/mock/mock-match-media.ts

@@ -153,7 +153,9 @@ export class MockMatchMedia extends MatchMedia {
   private _deactivateAll() {
     if (this._actives.length) {
       // Deactivate all current MQLs and reset the buffer
-      this._actives.map(it => it.deactivate());
+      for (const it of this._actives) {
+        it.deactivate();
+      }
       this._actives = [];
     }
     return this;