Fixes typo in celerybeat init script. Closes #1668

extra/generic-init.d/celerybeat

@@ -84,7 +84,7 @@ fi
 
 CELERYBEAT_CHDIR=${CELERYBEAT_CHDIR:-$CELERYD_CHDIR}
 if [ -n "$CELERYBEAT_CHDIR" ]; then
-    DAEMON_OPTS="$DAEMON_OPTS --workdir $CELERYBEAT_CHDIR"
+    DAEMON_OPTS="$DAEMON_OPTS --workdir=$CELERYBEAT_CHDIR"
 fi