istoreos/ota: fix cancel downloading task

```
    fcurl --connect-timeout 5 --progress-bar -o /tmp/firmware.img.part "$OTA_URL_BASE/$img" 2>/tmp/firmware.img.progress &
    local pid="$!"
```

if we don't use alias, the pid will point to sub shell, not curl.

on canceling, kill signal should send to curl.

package/diy/luci-app-ota/Makefile

@@ -3,7 +3,7 @@ include $(TOPDIR)/rules.mk
 
 LUCI_TITLE:=LuCI for OTA upgrade
 LUCI_PKGARCH:=all
-PKG_VERSION:=1.3.1
+PKG_VERSION:=1.3.2
 PKG_RELEASE:=1
 PKG_MAINTAINER:=jjm2473 <jjm2473@gmail.com>
 

package/diy/luci-app-ota/root/bin/ota

@@ -19,9 +19,7 @@ sha256() {
     sha256sum $1 | cut -d' ' -f1
 }
 
-fcurl() {
-    curl -L --fail --show-error "$@"
-}
+alias fcurl='curl -L --fail --show-error'
 
 download() {
     local img=$1