fix: rely on browser or tech to handle autoplay (#4582)

When setting the source, we were calling `play` if `autoplay` was set. We shouldn't do that and instead we should rely on the browser or tech (like Flash) to handle it properly.

src/js/player.js

@@ -1076,7 +1076,6 @@ class Player extends Component {
       } catch (e) {
         log('deleting tag.poster throws in some browsers', e);
       }
-      this.play();
     }
   }
 
@@ -2363,10 +2362,6 @@ class Player extends Component {
         this.load();
       }
 
-      if (this.options_.autoplay) {
-        this.play();
-      }
-
     // Set the source synchronously if possible (#2326)
     }, true);