build-release: use +dirty instead of -dirty version suffix when there are uncommitted files

Because:

- 0.54-dirty > 0.54-20230315-205943-91a9359
- 0.54+dirty < 0.54-20230315-205943-91a9359

We want uncommitted files to produce a lower package version
than the version the same files would produce once committed.

See:

- DaemonEngine/Urcheon@8c7d2fb

Author: illwieckz

build-release

@@ -281,7 +281,7 @@ printVersion () {
 
 	if ! git diff --quiet 2>/dev/null
 	then
-		dirt_string='-dirty'
+		dirt_string='+dirty'
 	fi
 
 	echo "${tag_string}${date_string}${ref_string}${dirt_string}"