docker-credential-pass: Fix broken post_install

There cannot be two `post_install` hooks in the template, it made the
second hook overwrite the first, which meant /usr/bin/cmd was never
moved.

srcpkgs/docker-credential-pass/template

@@ -1,7 +1,7 @@
 # Template file for 'docker-credential-pass'
 pkgname=docker-credential-pass
 version=0.6.4
-revision=1
+revision=2
 wrksrc="docker-credential-helpers-${version}"
 build_style=go
 go_import_path="github.com/docker/docker-credential-helpers"
@@ -16,8 +16,5 @@ checksum=b97d27cefb2de7a18079aad31c9aef8e3b8a38313182b73aaf8b83701275ac83
 
 post_install() {
 	mv ${DESTDIR}/usr/bin/cmd ${DESTDIR}/usr/bin/docker-credential-pass
-}
-
-post_install() {
 	vlicense LICENSE
 }