Removed the unneeded now wikidiff2.ini override

We used to ship wikidiff2.ini to override the package provided one in
order to solve a bug in the package. Package has been rebuilt with the
bug fixed, as a result the puppet provisioning of wikidiff2.ini
redundant

Change-Id: I326e286b696baf59ad7e7d4795fad4dc0af9953b
RT: 4028
Merge "Removed the unneeded now wikidiff2.ini override" into production