dim: Put ducttape back ont pull-request-next

Something slightly changed in the git log output and the regex fell
appart.

Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>

dim

@@ -424,7 +424,7 @@ function dim_pull_request
 
 	if [ "$branch" = "drm-intel-next" ]; then
 		# drm-intel-next pulls have been tagged using dim update-next
-		drm_intel_next_tags=`git log $DIM_DRM_INTEL_REMOTE/drm-intel-next ^$upstream --decorate | grep "(.*tag: drm-intel-next-" | sed -e "s/^.*(.*tag:.*\(drm-intel-next-[^ ,]*\).*)$/\1/"`
+		drm_intel_next_tags=`git log $DIM_DRM_INTEL_REMOTE/drm-intel-next ^$upstream --decorate | grep "(.*tag: drm-intel-next-" | sed -e "s/^.*(.*tag: \(drm-intel-next-[^ ,]*\).*)$/\1/"`
 		prep_pull_mail $drm_intel_next_tags
 		tag=`git describe --all --exact $DIM_DRM_INTEL_REMOTE/drm-intel-next`
 	else