Remove the double-check in multiply_and_scale()

Revert commit 72b1f1d. It has been three months.

Bug: b:319140742
Bug: oss-fuzz:66474
Change-Id: I862715e70d47666333e36565e99447e073019856

av1/encoder/pickrst.c

diff --git a/av1/encoder/pickrst.c b/av1/encoder/pickrst.c
index 0b0ca1c..f604994 100644
--- a/av1/encoder/pickrst.c
+++ b/av1/encoder/pickrst.c
@@ -1127,15 +1127,6 @@
   // Let y = x * w / WIENER_TAP_SCALE_FACTOR
   //       = x * (w1 * WIENER_TAP_SCALE_FACTOR + w2) / WIENER_TAP_SCALE_FACTOR
   const int64_t y = x * w1 + x * w2 / WIENER_TAP_SCALE_FACTOR;
-  // Double-check the calculation using __int128.
-  // TODO(wtc): Remove after 2024-04-30.
-#if !defined(NDEBUG) && defined(__GNUC__) && defined(__LP64__)
-  const int32_t w = w1 * WIENER_TAP_SCALE_FACTOR + w2;
-  const __int128 z = (__int128)x * w / WIENER_TAP_SCALE_FACTOR;
-  assert(z >= INT64_MIN);
-  assert(z <= INT64_MAX);
-  assert(y == (int64_t)z);
-#endif
   return y;
 }