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

package.json

@@ -118,6 +118,9 @@
 				"displayName": "electron",
 				"testMatch": [
 					"**/tests/electron/**/*.[jt]s?(x)"
+				],
+				"testPathIgnorePatterns": [
+					"<rootDir>/tests/electron/helpers/"
 				]
 			},
 			{