java a11y tests: Drop evaluating never set relation

`git grep ValueNotPersistent` makes clear that this is
never set anywhere, so drop evaluating it.

See also

    commit fcb9e950fb
    Date:   Thu Aug 20 13:18:06 2020 +0200

        Fix typo in code

which changed the string used in a single place only,
without any effect on CI test results.

Change-Id: Ie978392158ca51a3a967e0dc66822a9518178327
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/210327
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>
Tested-by: Jenkins

qadevOOo/tests/java/ifc/accessibility/_XAccessibleValue.java

@@ -127,12 +127,6 @@ public class _XAccessibleValue extends MultiMethodTest {
         String noMax = "com.sun.star.comp.toolkit.AccessibleScrollBar";
         String implName = util.utils.getImplName(oObj);
 
-        if (tEnv.getObjRelation("ValueNotPersistent")!=null) {
-            log.println("Excluded since it works like AccessibleAction");
-            tRes.tested("setCurrentValue()",Status.skipped(true));
-            return;
-        }
-
         if (anotherFromGroup == null) {
             double newVal = curVal + 1;
             if (newVal > maxVal) newVal -= 2;