[Canvas] - dragging leaderboard (or component) into specific situations results in decimal width

[royendo]

Describe the bug When dragging a component into a specific situation, it results in DOUBLE type width which errors with

invalid width unit ".4" for item 0 in row 22: 'width' cannot have a unit

To Reproduce Steps to reproduce the behavior:

1. Create Canvas, set max width to 2400
2. Create a row with existing 4 components and drag fifth into the same row.
3. Errors

Expected behavior Successfully have 5 components in a single item row.

Screenshots See Slack Thread, in proj-canvas-dashboards