Incorrect DPR query string was provided in the product image URL

[GrassH]

Steps to Replicate

1. In admin, set Enable Adaptive Device Pixel Ratios to "Yes" and select Device Pixel Ratios
   
2. Set the device scaling to 200%
   
3. Access any frontend product (Simple/Configurable)
4. Open the browser's Network tab and check the requested URL, where the parameters include dpr=2%202x
   

Expected Result
Based on the documentation, the query string is dpr=2

Actual Result
the query string is dpr=2%202x

[GrassH]

PR #734