Fix request_save_previous_state signal type

doc/classes/ScriptEditorBase.xml

@@ -72,7 +72,7 @@
 			</description>
 		</signal>
 		<signal name="request_save_previous_state">
-			<param index="0" name="line" type="int" />
+			<param index="0" name="state" type="Dictionary" />
 			<description>
 				Emitted when the user changes current script or moves caret by 10 or more columns within the same script.
 			</description>

editor/plugins/script_editor_plugin.cpp

@@ -272,7 +272,7 @@ void ScriptEditorBase::_bind_methods() {
 	ADD_SIGNAL(MethodInfo("request_help", PropertyInfo(Variant::STRING, "topic")));
 	ADD_SIGNAL(MethodInfo("request_open_script_at_line", PropertyInfo(Variant::OBJECT, "script"), PropertyInfo(Variant::INT, "line")));
 	ADD_SIGNAL(MethodInfo("request_save_history"));
-	ADD_SIGNAL(MethodInfo("request_save_previous_state", PropertyInfo(Variant::INT, "line")));
+	ADD_SIGNAL(MethodInfo("request_save_previous_state", PropertyInfo(Variant::DICTIONARY, "state")));
 	ADD_SIGNAL(MethodInfo("go_to_help", PropertyInfo(Variant::STRING, "what")));
 	ADD_SIGNAL(MethodInfo("search_in_files_requested", PropertyInfo(Variant::STRING, "text")));
 	ADD_SIGNAL(MethodInfo("replace_in_files_requested", PropertyInfo(Variant::STRING, "text")));