tst_QProcess: remove duplicate DisableCrashLogger variable

Amends 90bc0ad41f9937f9cba801b3166635f6f55e0678.

Pick-to: 6.8
Change-Id: I3faad81a5748ed0942d4fffd93c82124fc18b751
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
(cherry picked from commit 08cd38078e11988530251240096b3686e26dd783)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

tests/auto/corelib/io/qprocess/tst_qprocess.cpp

@@ -1677,9 +1677,6 @@ void tst_QProcess::terminateInChildProcessModifier()
     QFETCH(QProcess::ExitStatus, exitStatus);
     QFETCH(bool, stderrIsEmpty);
 
-    // temporarily disable QTest's crash logger
-    DisableCrashLogger disableCrashLogging;
-
     // testForwardingHelper prints to both stdout and stderr, so if we fail to
     // fail we should be able to tell too
     QProcess process;