icons: remove "animated" hourglass icons

Origin commit data
------------------
Commit: 8084b88df0
Author: vanhofen <vanhofen@gmx.de>
Date: 2021-10-09 (Sat, 09 Oct 2021)

Origin message was:
------------------
- icons: remove "animated" hourglass icons

data/icons/hourglass/Makefile.am

@@ -1,10 +1,4 @@
 installdir = $(ICONSDIR)
 
 install_DATA = \
-	hourglass0.png \
+	hourglass0.png
-	hourglass1.png \
-	hourglass2.png \
-	hourglass3.png \
-	hourglass4.png \
-	hourglass5.png \
-	hourglass6.png