.coveragerc: remove reference to non-existing paster_commands dir

The corresponding code is now in kallithea/bin/, which is already in the
omit list.

.coveragerc

@@ -4,9 +4,8 b' omit ='
     kallithea/bin/*
     # we ship with no active extensions
     kallithea/config/rcextensions/*
-    # dbmigrate and paster_commands are not part of the Kallithea web app
+    # dbmigrate is not a part of the Kallithea web app
     kallithea/lib/dbmigrate/*
-    kallithea/lib/paster_commands/*
     # the tests themselves should not be part of the coverage report
     kallithea/tests/*
     # the scm hooks are not run in the kallithea process