Maintain existing scm type for source directories.

With some git module IDs in the XML ending up the same as still-used
Subversion modules, it makes more sense to maintain the existing status
of present source directories instead of trying to use the wrong scm
tool.

Later I need to add detection for e.g. "MIGRATED" files to influence scm
type detection, but this works a bit better for now.

kdesrc-build

@@ -3194,7 +3194,7 @@ sub default_module_options
     my @nonKDEgitModules = qw(
         qt-copy kdesupport dbusmenu-qt
         kdemultimedia kdeartwork kdeutils kdegraphics kdegames
-        kdetoys kdeedu kdenetwork
+        kdetoys kdeedu kdenetwork kdesdk
     );
 
     if (not list_has(@nonKDEgitModules, $module)) {
@@ -5304,16 +5304,16 @@ sub handle_updates
         my $count;
 
         eval {
-            if (module_scm_type($module) eq 'git') {
-                # Handle git module update
-                $count = update_module_git_checkout($module);
-            }
-            elsif (-e "$fullpath/.svn")
+            if (-e "$fullpath/.svn")
             {
                 # Warn user if the current repo URL is different than expected.
                 check_module_validity($module);
                 $count = update_module_path($module, @options);
             }
+            elsif (module_scm_type($module) eq 'git') {
+                # Handle git module update
+                $count = update_module_git_checkout($module);
+            }
             else
             {
                 $count = checkout_module_path($module, @options);