[Glitch] Fix title tooltip appearing for fullscreen videos

Port 697e96c220e49794516cca88a46a6d193e95a994 to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/features/video/index.tsx

@@ -842,7 +842,7 @@ export const Video: React.FC<{
             role='button'
             tabIndex={0}
             aria-label={alt}
-            title={alt}
+            title={fullscreen ? undefined : alt}
             lang={lang}
             onClick={handleClick}
             onKeyDownCapture={handleVideoKeyDown}