Prevent `splitAttributes` from splitting elements with one attribute

[alesso-x]

When splitAttributes is enabled, elements with one attribute get split onto multiple line. For example:

<myelement key="some_key">hellow</myelement>

becomes

<myelement
          key="some_key">hellow</myelement>

The splitAttributes comment says it will split multiple attributes onto a new line. I'm not sure if this is the expected behavior but it would nice to have elements with one attribute stay on the same line.

// Split multiple attributes each onto a new line
"xml.format.splitAttributes": true,

[NikolasKomonen]

@alessandrodimarco Thanks for pointing this out, you're right. It'll be fixed in the next release.