Gui: Make Report View properly claim Select All (Ctrl+A) shortcut

Currently if user tries to use CTRL+A on Report View while having
document opened, it rejects the action and nothing happens.

This happened during the introduction of Select All (CTRL+A) behavior in
Sketcher. Basically, before Report View was not catching the event, but
neither any widget, resulting in QTextEdit catching it at the end of the
chain. Now, after enabling it for the whole document,
Report View rejected it, but we have registered it throughout the
document, so another widget was intercepting the event.

So, fix for that is simple - add a check for Select All shortcut on
Report View level, so the event will get consumed instead of being
rejected and propagated to further widgets.

src/Gui/ReportView.cpp

@@ -555,7 +555,7 @@ bool ReportOutput::event(QEvent* event)
 {
     if (event && event->type() == QEvent::ShortcutOverride) {
         auto kevent = static_cast<QKeyEvent*>(event);
-        if (kevent == QKeySequence::Copy)
+        if (kevent == QKeySequence::Copy || kevent == QKeySequence::SelectAll)
             kevent->accept();
     }
     return QTextEdit::event(event);