cpkg: fix random failure with GIT_ASKPASS script

vars/cpkg.groovy

@@ -94,7 +94,6 @@ def call(Map params = [:]) {
             def randomUUID = UUID.randomUUID().toString()
             def tmpAskPassScript = pwd(tmp:true) + "/${randomUUID}"
             try {
-                node {
                 writeFile(
                     file: tmpAskPassScript,
                     text: '''
@@ -105,7 +104,6 @@ def call(Map params = [:]) {
                     esac
                     '''
                 )
-                }
                 sh(script: "git config user.email '${gitEmail}'")
                 sh(script: "git config user.name '${gitUsername}'")
                 sh(script: "chmod +x '${tmpAskPassScript}'")