[BUGFIX] Drop the checks for the image file size from the install tool

The file sizes of the generated images in the install tool may somewhat differ in size while
the images are perfectly fine. Thus these checks do not provide helpful information, but
produce false warnings. This change removes this image file size check.

Change-Id: I60fb288945ed56e42940218c95a38f7202bf05bb
Resolves: #M17849
Reviewed-on: http://review.typo3.org/1012


Reviewed-by: Philipp Gampe <forge.typo3.org@philippgampe.info>
Tested-by: Philipp Gampe <forge.typo3.org@philippgampe.info>
Reviewed-by: Christian Mueller <christian@kitsunet.de>
Reviewed-by: Arvid Jakobsson <arvid.jakobsson@gmail.com>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Dmitry Dulepov <dmitry@typo3.org>
Tested-by: Dmitry Dulepov <dmitry@typo3.org>