Move Show all check box next to other check box

The placement between the tree view and the group boxes felt wrong.
In particular, now the check box doesn't jump around when a failed test
is selected.

GnuPG-bug-id: 6101

src/dialogs/selftestdialog.cpp

@@ -357,10 +357,6 @@ private:
                 resultsTV->setAllColumnsShowFocus(true);
                 vbox->addWidget(resultsTV);
 
-                showAllCB = new QCheckBox{i18nc("@option:check", "Show all test results"), qq};
-                showAllCB->setChecked(true);
-                vbox->addWidget(showAllCB);
-
                 splitter->addWidget(widget);
             }
             {
@@ -425,9 +421,12 @@ private:
 
             mainLayout->addWidget(splitter);
 
+            showAllCB = new QCheckBox{i18nc("@option:check", "Show all test results"), qq};
+            showAllCB->setChecked(true);
+            mainLayout->addWidget(showAllCB);
+
             runAtStartUpCB = new QCheckBox{i18nc("@option:check", "Run these tests at startup"), qq};
             runAtStartUpCB->setChecked(true);
-
             mainLayout->addWidget(runAtStartUpCB);
 
             buttonBox = new QDialogButtonBox{qq};