[Elements] Global CSS var prefixes for WebComponents Button component is still --igx

[skrustev]

Description

It appears that the CSS vas for the Button component are still have --igx prefixes instead of --ig one.
Related to #12974

• igniteui-webcomponents version: 4.3.0
• browser: any

Steps to reproduce

1. Open any WC sample and add a button or a grid using button with lates 4.3.0 version
2. Inspect the igcButton style vars

Result

Expected result

Button css vars should have --ig prefix

[github-actions]

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