fix(gdscript): Fix infinite loop on type inferernce from super method calls

When infering the type from a `super()` call, the gdscript_editor didn't use the base class to search for the original implementation of the method, but instead searched in the extending class.
This caused the same function to be analyzed for type inference which created the infinite loop.

Solves #63592

modules/gdscript/gdscript_editor.cpp

@@ -1473,11 +1473,16 @@ static bool _guess_expression_type(GDScriptParser::CompletionContext &p_context,
 					if (callee_type == GDScriptParser::Node::IDENTIFIER || call->is_super) {
 						// Simple call, so base is 'self'.
 						if (p_context.current_class) {
-							base.type.kind = GDScriptParser::DataType::CLASS;
-							base.type.type_source = GDScriptParser::DataType::INFERRED;
-							base.type.is_constant = true;
-							base.type.class_type = p_context.current_class;
-							base.value = p_context.base;
+							if (call->is_super) {
+								base.type = p_context.current_class->base_type;
+								base.value = p_context.base;
+							} else {
+								base.type.kind = GDScriptParser::DataType::CLASS;
+								base.type.type_source = GDScriptParser::DataType::INFERRED;
+								base.type.is_constant = true;
+								base.type.class_type = p_context.current_class;
+								base.value = p_context.base;
+							}
 						} else {
 							break;
 						}