Describe the bug

Having issue with height of grid when setting custom rowHeight & margin. Row height is also adding margin into its height calculation.
For example: rowHeight = 20 & margin = [12,12], then final rowHeight of grid will be 1 * 20(rowHeight) 12(margin[0]).

Your Example Website or App

https://codesandbox.io/p/sandbox/infallible-bessie-rlpvdz?file=/src/App.tsx:17,38

Steps to Reproduce the Bug or Issue

1. Navigate to the codesandbox and start the environment
2. Inspect the hight of all 3 card. you can see the differences.

Expected behavior

Card 1 is taking 20 px height as expected.
But card 2 & 3 height should be 2 * 20px = 40px & 3 * 20px = 60px respectively

react-grid-layout library version

1.4.4

Operating System Version

macOS

Browser

Chrome

Additional context

No response

Screenshots or Videos