The resizing line goes beyond the list item area

Hi team, I found a bug that the resizing line goes beyond the list item area, like following picture, the line in the red box is not needed, that is, the line is too long.

You can reproduce the issue in [playground](https://autodesk.github.io/react-base-table/playground#MYewdgzgLgBKA2BXAtpGBeGBzApmHATgIZQ4DCISqEAFAIwAMAlAFCiSwAmJRG2ehEjgAiPGghSQANDADMrdtBgAzAiABeeUVF6Zc+YqW1FxlSRBl0ZAclUa8AWjUB3B9dZtwS5QEsAHjicFFRomBLUAHTIRAAONKYhMuFgAJJgnDh+TBgAfDAA3iwwMPA4sHaaYEUwPsowCZJpGX4wADwwAEzZFXh8wZIRAGJqlcI+BDjAUD7gEQAyAKKDACrVtfXJTZkweQAc3SO9mP2oQ4dgYxNTM2ARAEopAOIAEqvFE1CIBGAFMBH-yRkPTAMgmEB86iIACNSgAuGBQAiIHAyaJ+ADqPk4UAAFvDZAwGDAAL4sYkeRSwTIxIjpE5gADSOAAnnxrMkHAxrCwWAB6XkwIicTgwCAgZA4UWIKE1UjICAsZQgAj1UqwHx8BgAbhqbTkOp8AGpDdlCsVuDoIjFEBAcTQzcU-v8LUQANoMAC6UmqxSx8IABgASfIu90eiJY4kOCDShzBnzE-3ex0wGkTMBQFKceGhz0RzjJx2u6m0oJmVBM5kegMAZWlMHjicL5OqLqtNrtDuK-wioY6Xp9NWzMCDIZ4rv7+ajMahcfyCaTg7TeEzw774axheKxb8NLp5cZLOrI7rMsbi+KLfNPHbtvtg57663Q4DwfXU+jsZnc4Xz+XGazV8xx0CcN04adY3PZ8dz3MsQkrY9-VPBxTwbecm2qFtSU8DgEQmEQeD4RAwGUeASFIMAaBdDxqWVLgcGUIhEHgWAaGydA8hoapWmWaFSkHXwAk4QdkggdB8kEwJ6QgUkUxdcTERwAidFkx1gWMcT1J4VTihLfd4JZcS9LgyRKx0mBwHpO4cHBTRxKIa5wBoaxLIPazbJwdxzNckJ3IhHAFnSezHMolywCsmz-MCzgvOqXkchYVggA)

Hope that can be fixed, or provide a interface for user to change the height of this line, thanks.