Made slide-toggle label non user selectable

[tsndr]

Since checkbox labels aren't user-selectable, I've thought it would be a more consistent behavior if slide toggles aren't either.

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[tsndr]

@googlebot I signed it!

[crisbeto]

The CI is failing because:

1. You should use the user-select mixin from vendor-prefixes.
2. The commit title isn't formatted correctly. It should start with fix(material/slide-toggle):.

[tsndr]

Sorry, this is my first time contributing.

Thank you for clarifying, I've made the requested changes so we should be golden now.

[tsndr]

I've noticed that CI still failed because my first commit still isn't formatted correctly. Do I have to make a new PR, or can I do anything else to fix it?

[crisbeto]

You'll have to change the message on the first commit as well. Force pushing to rewrite it is allowed.

[tsndr]

Alright, fixed it :)

[crisbeto]

LGTM

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