(maint) Removing unneeded patch from %install in RPM spec

Removing patch rundir-perms.patch from RPM spec as it is no longer needed.
The patch was to dynamically change the rundir mode from 01777 to 0755 for Redhat.
The rundir mode was changed to 0755 in lib/puppet/defaults.rb in commit a05d613751335fd16a222bf2e2300e7ccf41dc8a
Merge pull request #1708 from jjulien/remove_rundir_patch

(maint) Removing unneeded patch from %install in RPM spec