Tighten parameter substitution tolerance

In collection templating syntax, do not tolerate whitespace after dollar sign. So while `{{ $param }}` is valid `{{ $ param }}` will be ignored.

src/application/Parser/Script/Compiler/Expressions/SyntaxParsers/ParameterSubstitutionParser.ts

@@ -1,7 +1,7 @@
 import { RegexParser, IPrimitiveExpression } from '../Parser/RegexParser';
 
 export class ParameterSubstitutionParser extends RegexParser {
-    protected readonly regex = /{{\s*\$\s*([^}| ]+)\s*}}/g;
+    protected readonly regex = /{{\s*\$([^}| ]+)\s*}}/g;
     protected buildExpression(match: RegExpMatchArray): IPrimitiveExpression {
         const parameterName = match[1];
         return {