vendor.lattice_ecp5: correctly generate OE signaling when xdr=0

This fixes a logic bug introduced in
6ce2b21.

Author: ktemkin

nmigen/vendor/lattice_ecp5.py

@@ -526,7 +526,7 @@ def get_oneg(a, invert):
             if "o" in pin.dir:
                 o = pin_o
             if pin.dir in ("oe", "io"):
-                t = ~pin.oe
+                t = Repl(~pin.oe, pin.width)
         elif pin.xdr == 1:
             if "i" in pin.dir:
                 get_ireg(pin.i_clk, i, pin_i)