Remove warnings for aura:component inline style with dynamic value

[combizs]

Summary

Short summary of what is going on or to provide context.
Using the Aura Components VSCode plugin, when you have a dynamic inline style for an aura component, error(s) should not be thrown by the validator.

Steps To Reproduce:

1. Create lightning component
2. Define a <div> to apply an inline style
3. Apply an inline style with a dynamic value, i.e.:

<aura:component>
  <aura:attribute name="red" type="String" default="#ff0000" />
  <div style="{!'padding:0.5rem; background-color:' + red}">hello world!</div>
</aura:component>

Expected result

Describe what should have happened.
There should be no warnings for the component file regarding this matter.

Actual result

Describe what actually happened instead.
There are 3 warnings: emptyRules, css-rcurlyexpected, css-rcurlyexpected

Additional information

Feel free to attach a screenshot.

VS Code Version:
Version 1.31.1 (1.31.1)

SFDX CLI Version:
sfdx-cli/6.55.1-be0b3dc4c4

OS and version:
mac darwin-x64

[ntotten]

Duplicate of #950