fix stupid whitespace that I added

calendar/installer/Makefile.in

@@ -78,11 +78,11 @@ MOZ_NONLOCALIZED_PKG_LIST = \
 MOZ_LOCALIZED_PKG_LIST = $(AB_CD)
 
 MOZ_OPTIONAL_PKG_LIST = \
-# adt = Additional Developer Tools (inspector)                                  
-#   adt \                                                                       
-# XXX Re-enable when we enable talkback for Sunbird                             
-#   talkback \                                                                  
-    $(NULL)                                                                     
+# adt = Additional Developer Tools (inspector)
+#   adt \
+# XXX Re-enable when we enable talkback for Sunbird
+#   talkback \
+    $(NULL)
 
 DEFINES += -DAB_CD=$(AB_CD)