qt, tests: Replace accidentally commited assert

* lang/qt/test/t-remarks.cpp (testRemarkReplaceSingleUIDExportable):
Use QVERIFY instead of assert.

--
An assert causes the temp directory not to be cleaned up. I
use this to analyze test failures.
If you want to see the tests home directory after a failure you
can just change a failing verify to an assert.

lang/qt/tests/t-remarks.cpp

@@ -156,7 +156,7 @@ private Q_SLOTS:
         target.update();
         const char *remark = target.userID(0).remark(seckey, err);
         QVERIFY(!err);
-        Q_ASSERT(remark);
+        QVERIFY(remark);
         QCOMPARE(QString::fromUtf8(remark), QStringLiteral("The quick brown fox "
                                                            "jumps over the lazy dog"));