transmission: include default 'web_home' dir in jail

Fixes 'transmission-web' for users which didn't manually configure the
'web_home' option.
Assume transmission's default in case 'web_home' isn't defined and
mount the directory so it can be accessed from inside the jail.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

net/transmission/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=transmission
 PKG_VERSION:=3.00
-PKG_RELEASE:=16
+PKG_RELEASE:=17
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
 PKG_SOURCE_URL:=@GITHUB/transmission/transmission-releases/master

net/transmission/files/transmission.init

@@ -160,7 +160,8 @@ transmission() {
 	procd_add_jail_mount_rw "$config_dir/blocklists"
 	procd_add_jail_mount_rw "$config_dir/stats.json"
 	procd_add_jail_mount_rw "$download_dir"
-	[ -d "$web_home" ] && procd_add_jail_mount_rw "$web_home"
+	web_home="${web_home:-/usr/share/transmission/web}"
+	[ -d "$web_home" ] && procd_add_jail_mount "$web_home"
 	procd_close_instance
 }