appfilter: Drop Etar's package name from the calendar drawable filter

The calendar app's package name was changed in https://gitlab.e.foundation/e/apps/calendar/-/commit/0086bb3b37cca00a40efb6737b4aa2fe78a82dae but the follow-up commit https://gitlab.e.foundation/e/apps/BlissIconPack/-/commit/01628e089f20ccccd8d227e66018bc5a0a59ed3e introduced a new filter rather than renaming the old one.
This change drops the old filter as both apps while share the same base, originate from different authors, and contain different modifications now.

Bug: e/backlog#2282



Test: Rebuild the package with this patch, install and reboot the device, notice Etar uses the default icon

Signed-off-by: Aayush Gupta <theimpulson@e.email>