fix: restore accidental edit

Author: fgdorais

src/Init/Data/Nat/Bitwise/Lemmas.lean

@@ -616,7 +616,7 @@ theorem or_mod_two_pow : (a ||| b) % 2 ^ n = a % 2 ^ n ||| b % 2 ^ n :=
 
 @[simp, grind =] theorem testBit_xor (x y i : Nat) :
     (x ^^^ y).testBit i = ((x.testBit i) ^^ (y.testBit i)) := by
-  simp [HXor.hXor, XorOp.xor, xor, testBit_bitwise]
+  simp [HXor.hXor, XorOp.xor, xor, testBit_bitwise ]
 
 @[simp, grind =] theorem zero_xor (x : Nat) : 0 ^^^ x = x := by
    apply Nat.eq_of_testBit_eq