Update OpenTUI submodule to include directional scroll API

Updates to commit 4880350 which adds direction parameter to ScrollAcceleration for directional momentum tracking.

🤖 Generated with Codebuff
Co-Authored-By: Codebuff <noreply@codebuff.com>

Author: brandonkachen

cli/src/components/multiline-input.tsx

@@ -397,7 +397,7 @@ export function MultilineInput({
   const displayText =
     focused && !isPlaceholder
       ? displayValue.slice(0, cursorPosition) +
-        '█' +
+        '│' +
         displayValue.slice(cursorPosition)
       : displayValue