fix(ast): Correct getParameters method call in UserDefinedFunction class and update related query

Author: GeekMasher

ql/lib/codeql/bicep/ast/Calls.qll

@@ -160,7 +160,7 @@ class UserDefinedFunction extends Callable instanceof UserDefinedFunctionImpl {
    *
    * @return The parameters node of the function
    */
-  Expr getParameters() { result = UserDefinedFunctionImpl.super.getParameters() }
+  Expr getParameters() { result = UserDefinedFunctionImpl.super.getParameter(_) }
 
   /**
    * Gets the parameter at the specified index.

ql/test/library-tests/ast/calls/Functions.ql

@@ -3,5 +3,5 @@ private import bicep
 query predicate functions(UserDefinedFunction function) { any() }
 
 query predicate functionParameters(UserDefinedFunction function, Parameter params) {
-  function.getParameters() = params
+  function.getParameter(_) = params
 }