Fix secp256k1_ge_set_all_gej_var parameter order

Rearranged secp256k1_ge_set_all_gej_var parameters so length comes after *a.

src/tests.c

@@ -2051,7 +2051,7 @@ void test_ge(void) {
             }
         }
         secp256k1_ge_set_table_gej_var(4 * runs + 1, ge_set_table, gej, zr);
-        secp256k1_ge_set_all_gej_var(4 * runs + 1, ge_set_all, gej, &ctx->error_callback);
+        secp256k1_ge_set_all_gej_var(ge_set_all, gej, 4 * runs + 1, &ctx->error_callback);
         for (i = 0; i < 4 * runs + 1; i++) {
             secp256k1_fe s;
             random_fe_non_zero(&s);