JI-1987 Fix inconsistency in fullscreen support

Previously we would not add fullscreen button when H5P
.fullscreenSupported is false, but we would attempt to force content on
small devices into fullscreen regardless of this flag. This caused
inconsistencies.
On a side-note forcing the content into fullscreen did work, so the H5P
.fullscreenSupported check is probably not valid for all cases, but now
it is consistent in IV at least.

Author: thomasmars

src/scripts/interactive-video.js

@@ -505,7 +505,12 @@ function InteractiveVideo(params, id, contentData) {
 
       // Auto toggle fullscreen on play if on a small device
       var isSmallDevice = screen ? Math.min(screen.width, screen.height) <= self.width : true;
-      if (!self.hasFullScreen && isSmallDevice && self.$container.hasClass('h5p-standalone') && self.$container.hasClass('h5p-minimal')) {
+      const canPlayInFullScreen = H5P.fullscreenSupported
+        && !self.hasFullScreen
+        && isSmallDevice
+        && self.$container.hasClass('h5p-standalone')
+        && self.$container.hasClass('h5p-minimal');
+      if (canPlayInFullScreen) {
         self.toggleFullScreen();
       }
       self.video.play();