added new electron tests supporting date mocking (#2947)

first PR for #2942 

- added new electron tests for calendar which test new css classes from
https://github.com/MichMich/MagicMirror/pull/2939
- moved some compliments tests from `e2e` to `electron` because of date
mocking
- removed mock stuff from compliments module

tests/configs/modules/compliments/compliments_date.js

@@ -11,7 +11,6 @@ let config = {
 			module: "compliments",
 			position: "middle_center",
 			config: {
-				mockDate: "2020-01-01",
 				compliments: {
 					morning: [],
 					afternoon: [],