fix: only allow main button when drag image

[simonwong]

• Bug fix

问题描述

预览图片在点击鼠标右键后，图片会跟随鼠标移动。🧐 图片拖拽应该只允许使用左键。

[vercel]

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🔍 Inspect: https://vercel.com/react-component/image/30bkpmcoh
✅ Preview: https://image-git-fork-simonwong-hotfix-mousedownevent.react-component.vercel.app

[codecov]

Codecov Report

Merging #61 (6c856a1) into master (6f73023) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #61   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         5           
  Lines          228       229    +1     
  Branches        64        65    +1     
=========================================
+ Hits           228       229    +1     

Impacted Files	Coverage Δ
src/Preview.tsx	100.00% <100.00%> (ø)

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[shaodahong]

LGTM