[repomanage] Fix ordering of modular stream versions

List of stream versions should be ordered in ascending order (highest
version is on the right) because we are doing the list slicing from the
right (keepnum is negative).

= changelog =
msg: [repomanage] Fix ordering of modular stream versions
type: bugfix

plugins/repomanage.py

@@ -133,7 +133,7 @@ def run(self):
 
             # modular packages
             for streams_by_version in module_dict.values():
-                sorted_stream_versions = sorted(streams_by_version.keys(), reverse=True)
+                sorted_stream_versions = sorted(streams_by_version.keys())
 
                 new_sorted_stream_versions = sorted_stream_versions[-keepnum:]
 
@@ -156,7 +156,7 @@ def run(self):
 
             # modular packages
             for streams_by_version in module_dict.values():
-                sorted_stream_versions = sorted(streams_by_version.keys(), reverse=True)
+                sorted_stream_versions = sorted(streams_by_version.keys())
 
                 old_sorted_stream_versions = sorted_stream_versions[:-keepnum]