ui: set button text after loading app list in AppListDialogFragment

Otherwise, for lots of apps, the dialog shows before they're enumerated,
and the button text never gets set.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

ui/src/main/java/com/wireguard/android/fragment/AppListDialogFragment.kt

@@ -60,6 +60,7 @@ class AppListDialogFragment : DialogFragment() {
                     appData.clear()
                     appData.addAll(applicationData)
                 }
+                setButtonText()
             } catch (e: Throwable) {
                 withContext(Dispatchers.Main.immediate) {
                     val error = ErrorMessages[e]