Remove smb from X-KDE-Protocols lines

smb was included in the set of supported protocols since those X-KDE-Protocol
lines got introduced with 673be8e76856c6bc39f448f3374db4ae84258952 "add
X-KDE-Protocols," but as discussed in the mail thread starting at
<http://lists.freedesktop.org/archives/libreoffice/2014-September/063621.html>
"X-KDE-Protocols=...,smb,...," actual support for smb URLs in LO under KDE is
very fragile and typically requires further steps from the user (which vary
across the various LO configure options, --enable-gio vs. --enable-gnome-vfs,
and Linux distros) to work at all.

So it is probably best to not unconditionally claim smb support in those
X-KDE_Protocols lines at least in the vanilla LO sources (esp. since the TDF
builds with --enable-gnome-vfs need a really weird OOO_FORCE_DESKTOP=gnome
workaround to make it work at all, cf.
<http://lists.freedesktop.org/archives/libreoffice/2014-October/063876.html>
"Re: X-KDE-Protocols=...,smb,...").  Any Linux distros that are confident that
smb support in LO under KDE reliably works for them can patch those lines
locally.

Change-Id: I1c247d85825c96f0d74efcce3003e327a1522fa3