Switch tuple to list in projective_space.py

Part of the ongoing project to free Tuple of GAP.

src/sage/schemes/projective/projective_space.py

@@ -2374,7 +2374,7 @@ def rational_points(self, bound=0):
             for ai in R:
                 P[i] = ai
                 for tup in S[i - 1]:
-                    if gcd([ai] + list(tup)) == 1:
+                    if gcd((ai,) + tup) == 1:
                         for j in range(i):
                             P[j] = tup[j]
                         pts.append(self(P))