revert: refactor: Remove NSFileSystem injection (WIP)

This reverts commit f325b9b.

Author: sis0k0

nativescript-angular/resource-loader.ts

@@ -12,12 +12,8 @@ const extensionsFallbacks = [
 
 @Injectable()
 export class FileSystemResourceLoader extends ResourceLoader {
-    fs: NSFileSystem;
-
-    constructor() {
+    constructor(private fs: NSFileSystem) {
         super();
-
-        this.fs = new NSFileSystem();
     }
 
     get(url: string): Promise<string> {
@@ -61,7 +57,7 @@ export class FileSystemResourceLoader extends ResourceLoader {
         const candidates = extensionsFallbacks
             .filter(([extension]) => url.endsWith(extension))
             .map(([extension, fallback]) =>
-                this.replaceExtension(url, extension, fallback));
+                 this.replaceExtension(url, extension, fallback));
 
         const resource = candidates.find(candidate => this.fs.fileExists(candidate));