Reset view index in ItemInput clear method for consistent state (#277)

Fixes #276

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-->
## Summary by CodeRabbit

- **Bug Fixes**
- Resolved an issue where the visible area index was not resetting when
the input value was cleared.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

src/ItemInput.h

@@ -293,6 +293,7 @@ class ItemInput : public MenuItem {
      */
     void clear(MenuRenderer* renderer) {
         value[0] = '\0';
+        view = 0;
         draw(renderer);
         renderer->drawBlinker();
         // Log