win-wasapi: Add missing locale text

plugins/win-wasapi/data/locale/en-US.ini

@@ -4,6 +4,7 @@ ApplicationAudioCapture="Application Audio Capture (BETA)"
 Device="Device"
 Default="Default"
 UseDeviceTiming="Use Device Timestamps"
+Window="Window"
 Priority="Window Match Priority"
 Priority.Title="Window title must match"
 Priority.Class="Match title, otherwise find window of same type"