mpv: fix rubberband option

srcpkgs/mpv/template

@@ -1,7 +1,7 @@
 # Template file for 'mpv'
 pkgname=mpv
 version=0.16.0
-revision=5
+revision=6
 short_desc="Video player based on MPlayer/mplayer2"
 maintainer="Juan RP <xtraeme@voidlinux.eu>"
 license="GPL-3"
@@ -17,7 +17,7 @@ makedepends="
  pulseaudio-devel libbluray-devel libcdio-paranoia-devel libdvdread-devel
  MesaLib-devel harfbuzz-devel libXScrnSaver-devel jack-devel libdvdnav-devel
  wayland-devel libuuid-devel libguess-devel libXrandr-devel samba-devel
- $(vopt_if build_option_rubberband rubberband-devel)"
+ $(vopt_if rubberband rubberband-devel)"
 depends="desktop-file-utils hicolor-icon-theme youtube-dl"
 conf_files="/etc/mpv/*.conf"
 distfiles="https://github.com/mpv-player/${pkgname}/archive/v${version}.tar.gz"