[BUGFIX] Read permission check for folders is broken

The read permission check for folders is broken because there are some
inconsistencies in naming. For files the action to check is called "read",
for folders this check is called "browse". This should be adjusted for
folders to be equal to file check and renamed to "read".

Change-Id: I80862b60ea7d674df75dee0063764fed95570c6b
Fixes: #46582
Releases: 6.1, 6.0
Reviewed-on: https://review.typo3.org/19205
Reviewed-by: Alexander Opitz
Tested-by: Alexander Opitz
Reviewed-by: Tom Ruether
Reviewed-by: Stefan Neufeind
Reviewed-by: Wouter Wolters
Reviewed-by: Steffen Ritter
Tested-by: Steffen Ritter