UI: Remove excess row spacing in outliner popover

Some checkboxes had nonessential spacing between rows which made the
popover taller than needed.

release/scripts/startup/bl_ui/space_outliner.py

@@ -345,11 +345,9 @@ class OUTLINER_PT_filter(Panel):
         if display_mode != 'DATA_API':
             col = layout.column(align=True)
             col.prop(space, "use_sort_alpha")
-            layout.separator()
 
         row = layout.row(align=True)
         row.prop(space, "use_sync_select", text="Sync Selection")
-        layout.separator()
 
         row = layout.row(align=True)
         row.prop(space, "show_mode_column", text="Show Mode Column")