server: collection: Use ascii_alphanumeric

When sanitizing. As per the DBus spec [1] a path can only contain
[a-zA-Z0-9_].

Note that any such error would have been caught by OwnedPath::try_from,
but this allows more labels to be sanitized before they error out.

[1] https://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-marshaling-object-path

Author: A6GibKm

server/src/collection/mod.rs

@@ -394,7 +394,7 @@ impl Collection {
         let sanitized_label = label
             .chars()
             .map(|c| {
-                if c.is_alphanumeric() || c == '_' {
+                if c.is_ascii_alphanumeric() || c == '_' {
                     c
                 } else {
                     '_'