Revert "Exclude *.tmp (as requested in #2424 )"

Too many people complained about that the entry can not be removed
if this should be synced. Users that want that one be synced please
add it to the user exclude list.

This reverts commit 5860e5a46b39cc33dfb69fb75d038e70c2ffc682.

sync-exclude.lst

@@ -36,6 +36,6 @@ desktop.ini
 
 ~$*
 .~lock.*
-*.tmp
+~*.tmp
 
 *.gnucash.tmp-*