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/BufferViewer.cpp

@@ -2894,7 +2894,7 @@ void BufferViewer::exportData(const BufferExport &params)
     filter = tr("Binary Files (*.bin)");
 
   QString filename = RDDialog::getSaveFileName(this, tr("Export buffer to bytes"), QString(),
-                                               tr("%1;;All files (*.*)").arg(filter));
+                                               tr("%1;;All files (*)").arg(filter));
 
   if(filename.isEmpty())
     return;