sendemailsummary.php: correct path to INSTALLDIR
sendemailsummary.php: correct path to INSTALLDIR

So that we can actually find commandline.inc.

This should have been updated when the files in the EmailSummary tree
where moved down a level into subdirectories.

eXcomm/gnu-social,foocorp/gnu-social,furtherfield/gnu-social,bankonme/gnu-social,charnimda/lgbtpzn-social,bankonme/gnu-social,Piratas/tortuga,studio666/gnu-social,chimo/social,studio666/gnu-social,furtherfield/gnu-social,furtherfield/gnu-social,charnimda/lgbtpzn-social,bankonme/gnu-social,Piratas/tortuga,foocorp/gnu-social,chimo/social,charnimda/lgbtpzn-social,eXcomm/gnu-social,faulteh/gnu-social,foocorp/gnu-social,Piratas/tortuga,faulteh/gnu-social,furtherfield/gnu-social,studio666/gnu-social,eXcomm/gnu-social,faulteh/gnu-social,chimo/social,bankonme/gnu-social,faulteh/gnu-social,eXcomm/gnu-social,Piratas/tortuga,studio666/gnu-social