Add missing application icon, fix metainfo file

PKGBUILD

@@ -3,7 +3,7 @@
 
 pkgname=pantheon-videos
 pkgver=2.7.2
-pkgrel=2
+pkgrel=3
 pkgdesc='The Pantheon Video Player'
 arch=(x86_64)
 url='https://github.com/elementary/videos'
@@ -44,6 +44,13 @@ pkgver() {
   git describe --tags
 }
 
+prepare() {
+  cd pantheon-videos
+
+  git cherry-pick -n 3592c11d52568f0ccbf83b7a251ce330d6345e17
+  git cherry-pick -n 39c527787cf1b521a5c5717fedef26225c46aa63
+}
+
 build() {
   arch-meson pantheon-videos build
   ninja -C build