ui/qt: pass the bind labels through UserBindsPage

Missed caller from the label split: input_config_get_bind_string grew
two struct input_bind_label parameters, and this one is in C++ behind
HAVE_QT, so it was not covered by a C-only build.

The loop already has the port and bind index, so it indexes the label
arrays exactly like the equivalent site in menu_displaylist.c.

Verified by building with --enable-qt against Qt 5.15: ui_qt_widgets.cpp
compiles and the tree links. Config load/save round-trip on the
Qt-enabled binary still matches the pre-split baseline byte for byte
(88 labels).

Author: libretroadmin

ui/drivers/ui_qt_widgets.cpp

@@ -5800,7 +5800,10 @@ QWidget *UserBindsPage::widget()
             input_config_get_bind_auto(p, retro_id);
 
          input_config_get_bind_string(settings, descriptor,
-            keybind, auto_bind, sizeof(descriptor));
+            keybind, auto_bind,
+            &input_config_bind_labels[p][retro_id],
+            &input_autoconf_bind_labels[p][retro_id],
+            sizeof(descriptor));
 
          const struct retro_keybind *keyptr =
             &input_config_binds[p][retro_id];