fix(ng-package): umdModuleIds for classnames

Author: xidedix

projects/coreui/icons-angular/ng-package.json

@@ -2,7 +2,10 @@
   "$schema": "../../../node_modules/ng-packagr/ng-package.schema.json",
   "dest": "../../../dist/coreui-icons-angular",
   "lib": {
-    "entryFile": "src/public-api.ts"
+    "entryFile": "src/public-api.ts",
+    "umdModuleIds": {
+      "classnames": "classNames"
+    }
   },
   "whitelistedNonPeerDependencies": [
     "."