common should not provide hash, we have php-hash package

the provides was added on deadbranch-1.688.2 with
f01c1ac4dde0a4b15c51ea93fb2115d05002e1b4 (updated to work with current
snaps) and it was not shared at that time.

shared package was fixed in 8a6f25c975c721f4944f2469df0d6b366b880507
(update snap to 200903161730)