fix(Modal): fix close button alignment and color

[SevenOutman]

1. The close button should have been aligned with the title by their top edges, according to design materials.

2. Add a hover color

[vercel]

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Name	Status	Preview	Updated
rsuite-nextjs	✅ Ready (Inspect)	Visit Preview	Dec 9, 2022 at 10:15AM (UTC)

1 Ignored Deployment

Name	Status	Preview	Updated
rsuite-v4	⬜️ Ignored (Inspect)		Dec 9, 2022 at 10:15AM (UTC)

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[codecov]

Codecov Report

Base: 93.06% // Head: 93.07% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (7c3d3b7) compared to base (20af7a3).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2973   +/-   ##
=======================================
  Coverage   93.06%   93.07%           
=======================================
  Files         557      557           
  Lines       20004    20004           
  Branches     2717     2717           
=======================================
+ Hits        18617    18618    +1     
  Misses        734      734           
+ Partials      653      652    -1     

Flag	Coverage Δ
ChromeCi	93.03% <ø> (+<0.01%)	⬆️
Firefox	92.30% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/Animation/Transition.tsx	85.32% <0.00%> (+0.91%)	⬆️

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