feat(livechat): chat size and close button corrected

[oalkabouss]

ref: MANAGER-13415

Question	Answer
Branch?	master
Bug fix?	no
New feature?	yes
Breaking change?	no
Tickets	Fix #MANAGER-13415
License	BSD 3-Clause

• [x] Try to keep pull requests small so they can be easily reviewed.
• [x] Commits are signed-off
• [ ] ~~Only FR translations have been updated~~
• [x] Branch is up-to-date with target branch
• [x] Lint has passed locally
• [x] Standalone app was ran and tested locally
• [x] Ticket reference is mentioned in linked commits (internal only)
• [ ] ~~Breaking change is mentioned in relevant commits~~

Description

• fixed the cross to close the live chat
• fixed live chat dialog size

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