fix: change default value of input type from null to text

[re-fort]

according to W3C, when omitting the type of input(e.g. <input />), the type must be treated as text.

The missing value default is the Text state.

after #1170, that case is treated as null and is not masked correctly.
this PR resolves this.

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[re-fort]

cc: @mydea

[YunFeng0817]

This looks good to me. @mydea Do you think it's OK to set 'text' as the default value?

[mydea]

This should not be necessary, because input.type will already return text for <input /> - I actually fixed this in a previous PR.

IMHO I would not do this change, because right now it will return null only when called on non-input elements, which IMHO is safer than to have e.g. getInputType(divElement) === 'text'?

I fixed this here: #1184 - maybe we can/should just add a comment indicating that input.text will default to text?

[re-fort]

@mydea
ah, sorry.
i couldn't have checked your previous PR properly.
i've just added a comment in this PR.

and it would be helpful if you could also consider releasing rrweb@2.0.0-alpha.8

[YunFeng0817]

@re-fort 2.0.0-alpha.8 has been released!