GDScript: Fix setting to disable all warnings

The boolean was never set with the value from the project settings.

Fixes #64559.

modules/gdscript/gdscript_parser.cpp

@@ -147,6 +147,8 @@ GDScriptParser::GDScriptParser() {
 	register_annotation(MethodInfo("@warning_ignore", PropertyInfo(Variant::STRING, "warning")), AnnotationInfo::CLASS | AnnotationInfo::VARIABLE | AnnotationInfo::SIGNAL | AnnotationInfo::CONSTANT | AnnotationInfo::FUNCTION | AnnotationInfo::STATEMENT, &GDScriptParser::warning_annotations, varray(), true);
 	// Networking.
 	register_annotation(MethodInfo("@rpc", PropertyInfo(Variant::STRING, "mode"), PropertyInfo(Variant::STRING, "sync"), PropertyInfo(Variant::STRING, "transfer_mode"), PropertyInfo(Variant::INT, "transfer_channel")), AnnotationInfo::FUNCTION, &GDScriptParser::rpc_annotation, varray("", "", "", 0), true);
+
+	is_ignoring_warnings = !(bool)GLOBAL_GET("debug/gdscript/warnings/enable");
 }
 
 GDScriptParser::~GDScriptParser() {