fix(runtime-dom): fix conflicts between v-show and style display binding

[zhaozhongyu]

fix #4768

[edison1105]

BTW, the test case should cover #4424

[zhaozhongyu]

BTW, the test case should cover #4424

i had test undefined and it seems to work well.

[yyx990803]

It seems unnecessary to store the state in an additional property. 3f38d59 should revert it to original behavior while still fixing #4424.

[zhaozhongyu]

It seems unnecessary to store the state in an additional property. 3f38d59 should revert it to original behavior while still fixing #4424.

The commit 3f38d59 has conflicts between v-show and style display binding, testcases

it('should keep style "display:none" attribute on v-show control', () => {
    const el = document.createElement('div')
    el.style.cssText = 'display: none;';
    (el as any)._vod = '';
    patchProp(el as any, 'style', {}, { display: 'block' })
    expect(el.hasAttribute('style')).toBe(true)
    expect(el.style.display).toBe('none')
  })

  it('should keep style "display:none" attribute on v-show control2', () => {
    const el = document.createElement('div')
    el.style.cssText = 'display: none;';
    (el as any)._vod = '';
    patchProp(el as any, 'style', '', 'display:block;')
    expect(el.hasAttribute('style')).toBe(true)
    expect(el.style.display).toBe('none')
  })