benchmarks: remove call to removed psu method

Motivation:

See https://rb.dcache.org/r/13976/
master@62de04a14e

and

https://rb.dcache.org/r/13968/
Commit c0c11f4

The call to the removed switch should be eliminated
from the benchmark test.

Modification:

Do it.

Result:

IntelliJ is happy.

Target: master
Patch: https://rb.dcache.org/r/13980/
Requires-notes: no
Acked-by: Tigran

modules/benchmarks/src/main/java/org/dcache/util/PoolSelectionUnitBenchmarkCaching.java

@@ -347,7 +347,6 @@ public void setUp() throws CommandException {
     @Threads(value = 16)
     public int matchCaching() {
 
-        psu.setCachingEnabeled(true);
         String address = adresses[ThreadLocalRandom.current().nextInt(adresses.length)];
         PoolPreferenceLevel[] preference = psu.match(
               DirectionType.WRITE,  // operation