Fix DEBIAN path in make-deb.sh (#1117)

Summary:
I was trying to use `make-deb.sh`, and noticed that the path was wrong.

Pull Request resolved: #1117

Reviewed By: xavierd

Differential Revision: D50095231

Pulled By: genevievehelsel

fbshipit-source-id: a5a362c1fb5567e9d6792eb69380e51d2d62c707

watchman/build/package/watchman-deb/make-deb.sh

@@ -50,7 +50,7 @@ trap 'rm -rf -- "$PACKAGE_WORKDIR"' EXIT
 
 mkdir -p "$PACKAGE_WORKDIR$PREFIX"
 cp -ar "$BUILT/bin" "$PACKAGE_WORKDIR$PREFIX/bin"
-cp -ar watchman/build/package/DEBIAN "$PACKAGE_WORKDIR"
+cp -ar watchman/build/package/watchman-deb/DEBIAN "$PACKAGE_WORKDIR"
 
 sed -i "s/%VERSION%/$PACKAGE_VERSION/" "$PACKAGE_WORKDIR/DEBIAN/control"