Editorial: Simplify calculation of time duration in AdjustRounded...Days

As pointed out by Anba, in this call to RoundDuration the years...days
parameters are not used within RoundDuration because unit is less than
days. They are returned unchanged and discarded, so we may as well not
pass them in. This change isn't observable by userland code.

Closes: #2617

polyfill/lib/ecmascript.mjs

@@ -5571,10 +5571,10 @@ export function AdjustRoundedDurationDays(
       precalculatedPlainDateTime
     ));
     ({ hours, minutes, seconds, milliseconds, microseconds, nanoseconds } = RoundDuration(
-      years,
-      months,
-      weeks,
-      days,
+      0,
+      0,
+      0,
+      0,
       0,
       0,
       0,

spec/duration.html

@@ -1925,7 +1925,7 @@ <h1>
         1. If _oneDayLess_ &times; _direction_ &lt; 0, then
           1. Return ! CreateDurationRecord(_years_, _months_, _weeks_, _days_, _hours_, _minutes_, _seconds_, _milliseconds_, _microseconds_, _nanoseconds_).
         1. Let _adjustedDateDuration_ be ? AddDuration(_years_, _months_, _weeks_, _days_, 0, 0, 0, 0, 0, 0, 0, 0, 0, _direction_, 0, 0, 0, 0, 0, 0, *undefined*, _zonedRelativeTo_, _precalculatedPlainDateTime_).
-        1. Let _adjustedTimeDuration_ be ! RoundDuration(_adjustedDateDuration_.[[Years]], _adjustedDateDuration_.[[Months]], _adjustedDateDuration_.[[Weeks]], _adjustedDateDuration_.[[Days]], 0, 0, 0, 0, 0, _oneDayLess_, _increment_, _unit_, _roundingMode_).
+        1. Let _adjustedTimeDuration_ be ! RoundDuration(0, 0, 0, 0, 0, 0, 0, 0, 0, _oneDayLess_, _increment_, _unit_, _roundingMode_).
         1. Set _adjustedTimeDuration_ to ? BalanceTimeDuration(0, _adjustedTimeDuration_.[[Hours]], _adjustedTimeDuration_.[[Minutes]], _adjustedTimeDuration_.[[Seconds]], _adjustedTimeDuration_.[[Milliseconds]], _adjustedTimeDuration_.[[Microseconds]], _adjustedTimeDuration_.[[Nanoseconds]], *"hour"*).
         1. Return ! CreateDurationRecord(_adjustedDateDuration_.[[Years]], _adjustedDateDuration_.[[Months]], _adjustedDateDuration_.[[Weeks]], _adjustedDateDuration_.[[Days]], _adjustedTimeDuration_.[[Hours]], _adjustedTimeDuration_.[[Minutes]], _adjustedTimeDuration_.[[Seconds]], _adjustedTimeDuration_.[[Milliseconds]], _adjustedTimeDuration_.[[Microseconds]], _adjustedTimeDuration_.[[Nanoseconds]]).
       </emu-alg>