[BUGFIX] Ignore non-integer values for type in redirects

For redirects the parameter for page type is not validated as integer
resulting in invalid redirect urls. This patch checks for a valid integer
value and ignores it silently otherwise.

Resolves: #62527
Releases: master, 6.2
Change-Id: I9fd4564a3e4e13e4d64e27e090221e71edf06ae9
Reviewed-on: http://review.typo3.org/34193
Reviewed-by: Markus Klein <klein.t3@reelworx.at>
Tested-by: Markus Klein <klein.t3@reelworx.at>