fix: replace regex with correct project name valdiation

Author: Jefiozie

packages/angular/cli/lib/config/schema.json

@@ -27,7 +27,7 @@
     "projects": {
       "type": "object",
       "patternProperties": {
-        "^(?:@[a-z0-9-~][a-z0-9-._~]*\/)?[a-z0-9-~][a-z0-9-._~]*$": {
+        "^(?:@[a-zA-Z0-9_-]+\/)?[a-zA-Z0-9_-]+$": {
           "$ref": "#/definitions/project"
         }
       },