DelegatingURIConverter shouldn't override certain methods
The two single argument createInputStream and createOutputStream methods
already properly delegate to the corresponding two argument method, so
the DelegatingURIConverter should not override to directly delegate to
the delegate because that will result in bypassing the overrides of the
two argument method when the one argument method is called.
Change-Id: Iec66fc2d77a03a1b16faee078038e06fa33aebd1
Signed-off-by: Philip Langer <planger@eclipsesource.com>