[TASK] Remove duplicate vera.ttf from ext:core

vera.ttf is a font only used in the install tool, it was duplicated
to ext:install with the rewrite patch, but forgotten to be removed
from ext:core along the way. The file is removed from ext:core now
to finish the process.

Change-Id: Ibeb8a459655d51b0d5fd5269060c0a36b47b85fc
Resolves: #49261
Related: #49162
Releases: 6.2
Reviewed-on: https://review.typo3.org/21512
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn