fix: Import reflect-metadata(needed in JIT mode) before @angular

Author: vakrilov

Diff for: nativescript-angular/platform.ts

@@ -1,13 +1,15 @@
-// Always import platform-common first - because polyfills
+// Always reflect-metadata before @angular/core. 
+// It's needed to handle __metadata calls inside @angular/core
+import "reflect-metadata";
+
+// Import platform-common immediately after reflect-metadata - because rest of the polyfills.
 import {
     NativeScriptPlatformRef,
     AppOptions,
     PlatformFactory,
     COMMON_PROVIDERS
 } from "./platform-common";
 
-import "reflect-metadata";
-
 import { NSFileSystem } from "./file-system/ns-file-system";
 
 import {