Eliminate external pin in SPICE netlist
That will do, but you'll also have to take care of the pins, by deleting or commenting out 50 in:

.SUBCKT FDV301N 20 10 30 50

You could also make that a parameter, by transforming Vtemp into:

Vtemp 50 0 {temperature}

(or some other naming, but try to avoid temp, it's a keyword in SPICE) and adding:

.param temperature=25

With this, whenever you place the transistor in the schematic, you can add temperature={x} and even use a .STEP directive.