Applied the expiration date in each instance of DatePicker

src/main/java/com/owncloud/android/ui/adapter/UserListAdapter.java

@@ -336,7 +336,7 @@ public class UserListAdapter extends RecyclerView.Adapter<UserListAdapter.UserVi
                 return true;
             }
             case R.id.action_expiration_date: {
-                ExpirationDatePickerDialogFragment dialog = ExpirationDatePickerDialogFragment.newInstance(share, -1);
+                ExpirationDatePickerDialogFragment dialog = ExpirationDatePickerDialogFragment.newInstance(share, share.getExpirationDate());
                 dialog.show(fragmentManager, ExpirationDatePickerDialogFragment.DATE_PICKER_DIALOG);
                 return true;
             }

src/main/java/com/owncloud/android/ui/fragment/ShareFileFragment.java

@@ -351,7 +351,7 @@ public class ShareFileFragment extends Fragment implements ShareUserListAdapter.
                 return;
             }
             if (isChecked) {
-                ExpirationDatePickerDialogFragment dialog = ExpirationDatePickerDialogFragment.newInstance(mFile, -1);
+                ExpirationDatePickerDialogFragment dialog = ExpirationDatePickerDialogFragment.newInstance(mFile, mPublicShare.getExpirationDate());
                 dialog.show(
                         getActivity().getSupportFragmentManager(),
                         ExpirationDatePickerDialogFragment.DATE_PICKER_DIALOG