Fix reserving space before video loads

src/components/OnboardingWelcomeVideo.tsx

@@ -89,12 +89,6 @@ function OnboardingWelcomeVideo() {
     };
 
     const getWelcomeVideo = () => {
-        // When container didn't even mount and set it's dimensions,
-        // don't bother rendering the video player.
-        if (!containerDimensions.current) {
-            return;
-        }
-
         const videoWidth = containerDimensions.current.width - 2 * MODAL_PADDING;
 
         return (
@@ -104,7 +98,7 @@ function OnboardingWelcomeVideo() {
                     // for the video until it loads. Also, when
                     // welcomeVideoStatus === 'animation' it will
                     // set as much height as the video would.
-                    {height: videoWidth / videoAspectRatio},
+                    {width: '100%', aspectRatio: VIDEO_ASPECT_RATIO},
                 ]}
             >
                 {welcomeVideoStatus === 'video' ? (