fix: correctly handle null and undefined supply change values

Ensure the supplyChange check properly handles both null and undefined
to avoid displaying misleading formatted values when data is unavailable.

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: rickstaa

components/RoundStatus/index.tsx

@@ -442,7 +442,7 @@ const Index = ({
                     color: "white",
                   }}
                 >
-                  {supplyChangeData?.supplyChange !== null
+                  {supplyChangeData?.supplyChange != null
                     ? numbro(supplyChangeData?.supplyChange ?? 0).format({
                         output: "percent",
                         mantissa: 2,