Fix windows lnd build

Author: tanx

assets/script/build_app.sh

@@ -11,13 +11,9 @@ if [ "$(uname)" == "Darwin" ]; then
   npm run electron-pack -- --mac
 else
   # build binaries for windows
-  cd assets/bin/win32
-  env GOOS="windows" GOARCH="386" GO111MODULE="on" go get -tags="experimental" -v github.com/lightningnetwork/lnd@$LND_TAG
-  # enable mainnet neutrino in lnd
   cd $GOPATH/src/github.com/lightningnetwork/lnd
-  git fetch https://github.com/halseth/lnd.git mainnet-neutrino && git cherry-pick d1c23009e00298ed50173fb7cd60bdfb2937d50f
-  cd $TRAVIS_BUILD_DIR/assets/bin/win32
-  env GOOS="windows" GOARCH="386" GO111MODULE="on" go build -tags="experimental" -v github.com/lightningnetwork/lnd
+  GOOS="windows" GOARCH="386" GO111MODULE="on" go build -tags="experimental" -v github.com/lightningnetwork/lnd
+  cp lnd.exe $TRAVIS_BUILD_DIR/assets/bin/win32/
 
   # build the packages using electron-builder on docker
   cd $TRAVIS_BUILD_DIR