Minor syntax

+ Use Apache syntax with cases according to official docs: https://github.com/nextcloud/server/pull/16792/files#r315207691
+ Add missing whitespace for concatenating strings to variable: https://github.com/nextcloud/server/pull/16792/files#r315207520
+ Apache 2.5 will be released as 2.6: https://github.com/nextcloud/server/pull/16792/files#r315206147



Signed-off-by: Micha Felle <micha@dietpi.com>