[users] Clean up DMI model more for hostname

Remove anything in parentheses, and also drop the "Apple" prefix for
Apple machines. This converts:

"Apple MacBook Air (13-inch, M2, 2022)"

into:

"MacBookAir"

which is a lot more reasonable.

Other vendors could be added as needed (it's inconsistent whether DT
platforms prefix the model with the vendor or not).

Signed-off-by: Hector Martin <marcan@marcan.st>

src/modules/users/Config.cpp

@@ -321,7 +321,7 @@ Config::hostnameStatus() const
 static QString
 cleanupForHostname( const QString& s )
 {
-    QRegExp dmirx( "[^a-zA-Z0-9]", Qt::CaseInsensitive );
+    QRegExp dmirx( "(^Apple|\\(.*\\)|[^a-zA-Z0-9])", Qt::CaseInsensitive );
     return s.toLower().replace( dmirx, " " ).remove( ' ' );
 }