wg-installer: remove unused dependency

Remove the dependency "coreutils-realpath" from
wg-installer-server-hotplug-olsrd.

Signed-off-by: Nick Hainke <vincent@systemli.org>

net/wg-installer/Makefile

@@ -67,7 +67,7 @@ endef
 
 define Package/wg-installer-server-hotplug-olsrd
 	$(call Package/wg-installer-server)
-	DEPENDS:=wg-installer-server +coreutils-realpath
+	DEPENDS:=wg-installer-server
 endef
 
 define Package/wg-installer-server-hotplug-olsrd/install