bb/ui/crumbs/hobprefs: fix setting IMAGE_FSYTPES

We were setting the value as a list when a string is expected

Signed-off-by: Joshua Lock <josh@linux.intel.com>
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>

bitbake/lib/bb/ui/crumbs/hobprefs.py

@@ -38,7 +38,7 @@ def output_type_toggled_cb(self, check, handler):
         else:
             self.selected_image_types = handler.remove_image_output_type(ot)
 
-        self.configurator.setLocalConfVar('IMAGE_FSTYPES', "%s" % self.selected_image_types)
+        self.configurator.setLocalConfVar('IMAGE_FSTYPES', "%s" % " ".join(self.selected_image_types).lstrip(" "))
 
     def sdk_machine_combo_changed_cb(self, combo, handler):
         sdk_mach = combo.get_active_text()