fix(sfc): do not deindent space-padded output

[ypresto]

What kind of change does this PR introduce? (check at least one)

• Bugfix
• Feature
• Code style update
• Refactor
• Build-related changes
• Other, please describe:

Does this PR introduce a breaking change? (check one)

• Yes
• No

If yes, please describe the impact and migration path for existing applications:

parseComponent('...', { pad: 'space' }).script.content will contain code with base indent if SFC content has base indent. Also applies to styles or etc.

As #5058 and #5059, pad: 'space' is for character-oriented tools that calculate positions by distance from the beginning of the file instead of by line. This should be applied to source code itself, so I think it was buggy and breaking change is unavoidable.

The PR fulfills these requirements:

• It's submitted to the dev branch for v2.x (or to a previous version branch), not the master branch
• When resolving a specific issue, it's referenced in the PR's title (e.g. fix #xxx[,#xxx], where "xxx" is the issue number)
• All tests are passing: https://github.com/vuejs/vue/blob/dev/.github/CONTRIBUTING.md#development-setup
• New/updated tests are included

Other information:

I'm personally creating tool to convert export default { ... } to vue-property-decorators style, so I'm using vue-template-compiler with @vue/component-compiler-utils and code with original indent is needed.

[ktsn]

#7647

[ypresto]

Oh, this PR is dupe of that :P
Is that PR is likely to be merged? (looks so old...)

[yyx990803]

Thanks, we will merge #7647.