Fix last inline block item styling in the Add a new custom block off canvas

Problem/Motivation

height of last inline block item should be consistent with the other items.

Proposed resolution

Override the styling in core/misc/dialog/off-canvas.base.css that removes the padding from the last item

#drupal-off-canvas ul li:last-child, #drupal-off-canvas ol li:last-child {
    padding-bottom: 0;
    border-bottom: none;
  }

Remaining tasks

• ✅ File an issue about this project
• ✅ Addition/Change/Update/Fix to this project
• ✅ Testing to ensure no regression
• ➖ Automated unit/functional testing coverage
• ➖ Developer Documentation support on feature change/addition
• ➖ User Guide Documentation support on feature change/addition
• ✅ Update Release Notes and Update Helper on new feature change/addition
• ✅ Code review from 1 Varbase core team member
• ✅ Full testing and approval
• ✅ Credit contributors
• ✅ Review with the product owner
• ✅ Release varbase-9.0.5, varbase_layout_builder-10.0.10

Varbase update type:

• ✅ No Update
• ➖ Optional Update
• ➖ Forced Update
• ➖ Forced Update if Unchanged

User interface changes

• Fixes the height of the last item in inline blocks list

API changes

• N/A

Data model changes

• N/A