utils: Make ntemplate work in another directory.
utils: Make ntemplate work in another directory.

Previously `n.py` required the file replacement to be `"ntemplate` or
` ntemplate` (The idea being that the form should be replaced inside
includes like `href=""`).

However, neither will work if the file is in another directory (as it is
`/ntemplate`).

Instead just replace any `ntemplate.Nxxx` form.

Signed-off-by: Tim 'mithro' Ansell <b1c1d8736f20db3fb6c1c66bb1455ed43909f0d8@mith.ro>

SymbiFlow/symbiflow-arch-defs,SymbiFlow/symbiflow-arch-defs