[BUGFIX] Declare statically called method static

InlineElement::updateInlineView() is only used once throughout the core
and called statically, although the method is not declared to be static.

Fix this by declaring it static.

Resolves: #62501
Releases: 6.2, master
Change-Id: Ifeb8551899ccf285d87a66767bf7de4e8e98b32f
Reviewed-on: http://review.typo3.org/33582
Reviewed-by: Cedric Ziel <cedric@cedric-ziel.com>
Tested-by: Cedric Ziel <cedric@cedric-ziel.com>
Reviewed-by: Frank Nägler <typo3@naegler.net>
Tested-by: Frank Nägler <typo3@naegler.net>
(cherry picked from commit fc9666b257896a9fc59aab61b2c2ac8a196ef151)
Reviewed-on: http://review.typo3.org/33584