chore(react-styled-system): fixed linter errors (patternfly#3719)

* chore(react-styled-system): fixed linter errors

* addressed PR feedback

* fixed new linting errors from recently-merged Table PR

* replaced Object type with object

package.json

@@ -100,7 +100,7 @@
     "generate": "yarn plop",
     "lint:md": "yarn eslint packages/patternfly-4 --ext md --no-eslintrc --config .eslintrc-md.json --cache",
     "lint:style": "stylelint \"**/sass/**/*.scss\" \"!**/dist/**/*.scss\"",
-    "lint:ts": "node --max-old-space-size=4096 node_modules/.bin/eslint packages/patternfly-4/react-core packages/patternfly-4/react-table packages/patternfly-4/react-topology packages/patternfly-4/react-catalog-view-extension packages/patternfly-4/react-docs packages/patternfly-4/react-inline-edit-extension packages/patternfly-4/react-charts packages/patternfly-4/react-integration --ext js,jsx,ts,tsx --cache",
+    "lint:ts": "node --max-old-space-size=4096 node_modules/.bin/eslint packages/patternfly-4/react-core packages/patternfly-4/react-table packages/patternfly-4/react-topology packages/patternfly-4/react-catalog-view-extension packages/patternfly-4/react-docs packages/patternfly-4/react-inline-edit-extension packages/patternfly-4/react-charts packages/patternfly-4/react-integration packages/patternfly-4/react-styled-system --ext js,jsx,ts,tsx --cache",
     "lint:versions": "node ./packages/patternfly-4/verifyCoreVersions.js",
     "prettier": "node node_modules/.bin/prettier --write \"storybook/**/*.{js,ts,tsx}\" \"packages/**/*.{js,ts,tsx}\" \"scripts/**/*.{js,ts,tsx}\"",
     "serve:docs": "lerna run serve",