rpm: add missing Quamash dependency

Fixes QubesOS/qubes-issues#4316

rpm_spec/qmgr.spec.in

@@ -11,6 +11,7 @@ Requires:	python3
 Requires:	python3-PyQt4
 Requires:	python3-inotify
 Requires:	python3-qubesadmin >= 4.0.19
+Requires:	python3-Quamash
 Requires:	qubes-artwork
 Requires:	pmount
 Requires:	cryptsetup