[webui] Fix namespace issues when catching exceptions

This was causing following error when an exception occured in /projects/new_release_request:
  "uninitialized constant BsRequestAction::RepositoryWithoutReleaseTarget"

Commit that introduced this: a1632de

src/api/app/controllers/webui/project_controller.rb

@@ -173,9 +173,9 @@ def new_release_request
       rescue Patchinfo::IncompletePatchinfo,
              BsRequestAction::UnknownProject,
              BsRequestAction::BuildNotFinished,
-             BsRequestAction::RepositoryWithoutReleaseTarget,
-             BsRequestAction::RepositoryWithoutArchitecture,
-             BsRequestAction::ArchitectureOrderMissmatch,
+             BsRequestActionMaintenanceRelease::RepositoryWithoutReleaseTarget,
+             BsRequestActionMaintenanceRelease::RepositoryWithoutArchitecture,
+             BsRequestActionMaintenanceRelease::ArchitectureOrderMissmatch,
              BsRequestAction::VersionReleaseDiffers,
              BsRequestAction::UnknownTargetProject,
              BsRequestAction::UnknownTargetPackage => e