log_merge.sh: Fix removal of log files

Files are not being expanded and fails:

Removing Input log files !!!
rm: cannot remove 'GGSN_Tests*.log': No such file or directory

Change-Id: I74e1f00c5e2b41668ebf2060f547fcc01212956d
diff --git a/log_merge.sh b/log_merge.sh
index dee9cc2..d3c50f7 100755
--- a/log_merge.sh
+++ b/log_merge.sh
@@ -26,5 +26,5 @@
 
 if [ "$2" = "--rm" ]; then
 	echo "Removing Input log files !!!"
-	rm "$LOG_FILES"
+	rm $LOG_FILES
 fi