test(@ngtools/webpack): Move enhanced-resolve from peerDependencies to dependencies (#7385)

@ngtools/webpack requires a peer dependency of enhanced-resolve@^3.1.0. It currently relies on webpack providing this dependency and on NPM 3+ flat tree installation. Webpack could remove this dependency or NPM change the tree structure. This change also removes a NPM warning about missing peer dependency.

Author: aecz

packages/@ngtools/webpack/package.json

@@ -26,11 +26,11 @@
   },
   "dependencies": {
     "loader-utils": "^1.0.2",
+    "enhanced-resolve": "^3.1.0",
     "magic-string": "^0.22.3",
     "source-map": "^0.5.6"
   },
   "peerDependencies": {
-    "enhanced-resolve": "^3.1.0",
     "typescript": "^2.0.2",
     "webpack": "^2.2.0 || ^3.0.0"
   }