36019: Revert b/25095 breaks Special:Categories

36019: Revert b/25095 breaks Special:Categories

bug 25095: Special:Categories doesn't show first relevant item when "from" is filled"
bug 36019: Special:Categories does not keep "from" parameter between list size changes

This reverts commit 1a5edfa6c0584e2cdc8310f302962fd8daea31eb.

This commit broke behaviour of CategoryPager inherited
fromAlphabeticPager.

This was actually pointed out:

* https://www.mediawiki.org/wiki/Special:Code/MediaWiki/113415#c32002

This needs to go into 1.19 as well.

Conflicts:

	RELEASE-NOTES-1.19

Change-Id: I119160d59c4fca0d069adef60151b30d53b582a1