Enable the unicorn/prefer-ternary ESLint plugin rule

To limit the readability impact of these changes, the `only-single-line` option was used; please find additional details at https://github.com/sindresorhus/eslint-plugin-unicorn/blob/main/docs/rules/prefer-ternary.md

These changes were done automatically, using the `gulp lint --fix` command.

.eslintrc

@@ -78,6 +78,7 @@
     "unicorn/prefer-regexp-test": "error",
     "unicorn/prefer-string-replace-all": "error",
     "unicorn/prefer-string-starts-ends-with": "error",
+    "unicorn/prefer-ternary": ["error", "only-single-line"],
 
     // Possible errors
     "for-direction": "error",