style(@schematics/angular): prevent adding redundant whitespace in generated angular.json file

Previously "ng new" was generating angular.json file containing redundant whitespace after "version" property.
When file was edited some IDEs automatically removed this whitespace making additional change in diff.
If "packageManager" option is used, whitespace is still present.

(cherry picked from commit ed90080)

Author: wojteko22

packages/schematics/angular/workspace/files/angular.json.template

@@ -1,6 +1,6 @@
 {
   "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
-  "version": 1, <% if (packageManager) { %>
+  "version": 1,<% if (packageManager) { %>
   "cli": {
     "packageManager": "<%= packageManager %>"
   },<% } %>