run_my_doc: fix naming convention failure

use "Slideshow" for now. "Slide Show" would also be OK, the discussion
about what's the best term is still ongoing, this is an emergency commit
to repair tests.

bt5/erp5_run_my_doc/SkinTemplateItem/portal_skins/erp5_run_my_doc/TestPage_viewEditSlideShowWithGadget.xml

@@ -129,7 +129,7 @@
         </item>
         <item>
             <key> <string>title</string> </key>
-            <value> <string>Edit SlideShow</string> </value>
+            <value> <string>Edit Slideshow</string> </value>
         </item>
         <item>
             <key> <string>unicode_mode</string> </key>