SpecialEditWatchlist: Don't re-escape html option values.

SpecialEditWatchlist: Don't re-escape html option values.

HTMLForm class already escapes them. The values here should be
actual values that can be used directly internally without any
sort of encoding or escaping.

It was working fine because HTMLForm used this array two-way, so
it was also checking against the "wrong" values upon submission.

For the same reason, removing it here will not affect anything.

It does however fix the problem where it is hard to filter these
options in javascript because the values don't match.

Change-Id: Ieb0d4955febaccda2bdca58b316883337831ebfa