rust_binder: remove trailing comma

This prepares for a later commit in which we introduce a custom
formatting macro; that macro doesn't handle trailing commas so just
remove this one.

Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Signed-off-by: Tamir Duberstein <tamird@gmail.com>
Link: https://patch.msgid.link/20251018-cstr-core-v18-2-9378a54385f8@gmail.com
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

drivers/android/binder/process.rs

@@ -596,7 +596,7 @@ impl Process {
                     "  ref {}: desc {} {}node {debug_id} s {strong} w {weak}",
                     r.debug_id,
                     r.handle,
-                    if dead { "dead " } else { "" },
+                    if dead { "dead " } else { "" }
                 );
             }
         }