fix(carousel): calculation lastFullPageOffset

[dfvc]

It is not possible to reach the last slide by using swipe when navigation is enabled

Description

Before 0.16.0, it was not possible to reach the last slide by using navigation "next" button. Swiping everything worked fine. After update to 0.16.0, this behavor is inverted, i.e., I can reach the last slider by pressing "next" button but not by swiping.
This Pull Request fixes a calculation issue that was creating this unexpected behavior.

Motivation and Context

Fixes issue #345

How Has This Been Tested?

There is already a Vue Play case for this in the project, and was also tested manually in all VuePlay cases

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
  • I have updated the documentation accordingly.
• I have included a vue-play example (if this is a new feature)

[quinnlangille]

Looks good @dfvc, will merge now and release with v0.17.0 🚀 - should be out sometime next week