persistence: Fix regression in saving options, v2.

I left out a comma and thought I had already fixed with an amended
commit, but it turns out I had forgotten to run git-add first. :(

modules/ksb/BuildContext.pm

@@ -153,7 +153,7 @@ sub new
         rcFiles => [@rcfiles],
         rcFile  => undef,
         env     => { },
-        persistent_options => { } # These are kept across multiple script runs
+        persistent_options => { }, # These are kept across multiple script runs
         ignore_list => [ ], # List of KDE project paths to ignore completely
         kde_projects_metadata     => undef, # Enumeration of kde-projects
         kde_dependencies_metadata => undef, # Dependency resolution of kde-projects