Replace "All Files (*.*)" with "All Files (*)"

To quote the Qt documentation for QFileDialog::setNameFilters:

> Note that the filter *.* is not portable, because the historical
> assumption that the file extension determines the file type is not
> consistent on every operating system. It is possible to have a file
> with no dot in its name (for example, Makefile). In a native Windows
> file dialog, *.* will match such files, while in other types of file
> dialogs it may not. So it is better to use * if you mean to select
> any file.

Admittedly, one of these usages is Windows-only and we are using the
native file dialog there, but we might as well be consistent.

qrenderdoc/Windows/MainWindow.cpp

@@ -268,7 +268,7 @@ void MainWindow::on_action_Open_Log_triggered()
   QString filename = RDDialog::getOpenFileName(
       this, tr("Select Logfile to open"), m_Ctx.Config().LastLogPath,
       tr("Capture Files (*.rdc);;Image Files (*.dds *.hdr *.exr *.bmp *.jpg "
-         "*.jpeg *.png *.tga *.gif *.psd;;All Files (*.*)"));
+         "*.jpeg *.png *.tga *.gif *.psd;;All Files (*)"));
 
   if(!filename.isEmpty())
     LoadFromFilename(filename, false);