audio/lollypop: Replace reference to PY_PILLOW with its value

Since this port works with Python 3.6 and later, the value of
PY_PILLOW doesn't change. So replace reference to it with its value.

audio/lollypop/Makefile

@@ -21,7 +21,7 @@ RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}sqlite3>=2.7.8:databases/py-sqlite3@${PY_FLA
 		${PYTHON_PKGNAMEPREFIX}dbus>=1.1.1:devel/py-dbus@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}gstreamer1>=1.4.0:multimedia/py-gstreamer1@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}pylast>=1.4.0:audio/py-pylast@${PY_FLAVOR} \
-		${PY_PILLOW}
+		${PYTHON_PKGNAMEPREFIX}pillow>=7.0.0:graphics/py-pillow@${PY_FLAVOR}
 
 USES=		python:3.6+ pkgconfig gnome gettext gstreamer meson shebangfix sqlite desktop-file-utils
 USE_GITLAB=	yes