Currency Bear does not inject ANY theme code.
You will only need to revert your currency formatting.
Follow these steps:
1. Go to your Shopify admin > Settings
2. Click on General
3. Store currency - Change formatting:
In "HTML with currency" enter:
In "HTML without currency" enter:
4. Click Save.
(!) This applies for stores with USD default currency, follow the same steps and change the "USD" and "$" for other currencies.