Bug: Go back in Learn/Words

[samuele-brusegan]

Click go back in Learn/Words will crash the app.
The action to return to Learn Home is inverted.

[Sapoleone]

java.lang.lllegalArgumentException: Navigation action/destination com.sapoleone.morse:id/action_learnHomeFragment_to_learnWordsFragment cannot be found from the current destination
Destination(com.sapoleone.morse:id/learnWordsFragment) label-fragment-learn-words class=com.sapoleone.morse.ui.learn.words.LeamWordsFragment
at
androidx.navigation.NavController.navigate(NavController.kt:1691)