fix: video type

Author: SooY2

default-template/videoTest.html

@@ -277,10 +277,10 @@ <h4>
     </section>
 
     <!-- <video controls width="100%">
-        <source src="../video/videoplayback.mp4" type="video/webm" />
+        <source src="../video/videoplayback.mp4" type="video/mp4" />
     </video> -->
     <video controls width="100%">
-        <source src="../video/HTTP1.mp4" type="video/webm" />
+        <source src="../video/HTTP1.mp4" type="video/mp4" />
     </video>