logic to determin if we are renaming a var or parameter

Author: Razmo99

src/PowerShellEditorServices/Services/PowerShell/Refactoring/VariableVisitor.cs

@@ -78,7 +78,11 @@ public static Ast GetVariableTopAssignment(int StartLineNumber, int StartColumnN
  {
 
  // Look up the target object
- VariableExpressionAst node = GetAstNodeByLineAndColumn(OldName, StartLineNumber, StartColumnNumber, ScriptAst);
+ Ast node = GetAstNodeByLineAndColumn(StartLineNumber, StartColumnNumber, ScriptAst);
+
+ string name = node is CommandParameterAst commdef
+ ? commdef.ParameterName
+ : node is VariableExpressionAst varDef ? varDef.VariablePath.UserPath : throw new TargetSymbolNotFoundException();
 
  Ast TargetParent = GetAstParentScope(node);