Move support check from display to browser

kasmweb/core/util/browser.js

@@ -49,6 +49,15 @@ export function supportsCursorURIs() {
     return _cursor_uris_supported;
 }
 
+let _supportsImageMetadata = false;
+try {
+    new ImageData(new Uint8ClampedArray(4), 1, 1);
+    _supportsImageMetadata = true;
+} catch (ex) {
+    // ignore failure
+}
+export const supportsImageMetadata = _supportsImageMetadata;
+
 export function isMac() {
     return navigator && !!(/mac/i).exec(navigator.platform);
 }