fix(modal): prevent injecting __scTheme in DOM props

Fixes #99

Author: gregberge

packages/shared/core/Modal.js

@@ -77,6 +77,7 @@ class ModalComponent extends React.Component {
       onClick,
       onKeyDown,
       initialFocusRef,
+      __scTheme,
       ...props
     } = this.props
     return (

packages/shared/core/utils/createComponent.js

@@ -23,6 +23,7 @@ function createComponent(getConfig) {
 
   const omittedProps = [
     'theme',
+    '__scTheme',
     ...(system ? system.meta.props : {}),
     ...omitProps,
   ]