fix(ui): revert Duration and TTFT column widths to default

The explicit 90px/80px sizes were too narrow for the Duration (s) and
TTFT (s) headers once the sort arrows were factored in, cramping the
header labels. Dropping the size lets these two columns fall back to the
default width like before

ui/litellm-dashboard/src/components/view_logs/columns.tsx

@@ -264,7 +264,6 @@ export const createColumns = (sortProps?: LogsSortProps): ColumnDef<LogEntry>[]
         )
       : "Duration (s)",
     accessorKey: "request_duration_ms",
-    size: 90,
     cell: (info: any) => {
       const ms = info.getValue();
       if (ms == null) return <span>-</span>;
@@ -289,7 +288,6 @@ export const createColumns = (sortProps?: LogsSortProps): ColumnDef<LogEntry>[]
         )
       : "TTFT (s)",
     accessorKey: "completionStartTime",
-    size: 80,
     cell: (info: any) => {
       const row = info.row.original;
       const completionStartTime = info.getValue();