For #14642: Use correct 'Close tabs' summary text (#14644)

For "closeTabsAfterOneMonth", use the correct summary string of
"close_tabs_after_one_month" instead of "close_tabs_after_one_week".

This fixes the Settings page "Close tabs" summary showing the wrong
tab duration when "Close tabs" is set to "After one month".

Closes #14642

app/src/main/java/org/mozilla/fenix/utils/Settings.kt

@@ -368,7 +368,7 @@ class Settings(private val appContext: Context) : PreferencesHolder {
             appContext.getString(R.string.close_tabs_after_one_week)
         }
         closeTabsAfterOneMonth -> {
-            appContext.getString(R.string.close_tabs_after_one_week)
+            appContext.getString(R.string.close_tabs_after_one_month)
         }
         else -> {
             appContext.getString(R.string.close_tabs_manually)