Fix false-positive MPEG2/VC-1 direct play on Xbox WebView2

browser.edgeUwp matches the WebView2 Xbox client's user agent (Edg/ +
WebView2), which was originally meant for the old EdgeHTML/UWP host
that could genuinely hardware-decode MPEG2/VC-1 via Windows Media
Foundation. Chromium/WebView2 cannot decode these codecs, so the
server was told direct play was supported, causing direct play
attempts to fail and fall back to transcoding.

Add an xboxOne guard to supportsMpeg2Video() and supportsVc1(),
mirroring the existing canPlayAv1() workaround for the same class of
WebView2-on-Xbox false positive.

Refs jellyfin/jellyfin-xbox#113

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Author: Hydroplane72

src/scripts/browserDeviceProfile.js

@@ -237,10 +237,20 @@ function testCanPlayTs() {
 }
 
 function supportsMpeg2Video() {
+    if (browser.xboxOne) {
+        // webview2 on xbox matches the edgeUwp check but cannot actually decode mpeg2
+        return false;
+    }
+
     return browser.tizen || browser.web0s || browser.edgeUwp;
 }
 
 function supportsVc1(videoTestElement) {
+    if (browser.xboxOne) {
+        // webview2 on xbox matches the edgeUwp check but cannot actually decode vc-1
+        return false;
+    }
+
     return browser.tizen || browser.web0s || browser.edgeUwp || videoTestElement.canPlayType('video/mp4; codecs="vc-1"').replace(/no/, '');
 }