[dunecontrol,bugfix] bugfix the bugfix and use the correct module name.

This completes the last patch by using $m for the module name. Finally,
installed modules are found correctly.
(cherry picked from commit 1526e2754bc103524c9500000f2fd0a081c61b30)

Signed-off-by: Markus Blatt <markus@dr-blatt.de>