Fixes:grid-overlay for negetive input and 0

[aashna27]

Fixes #1203

Make sure these boxes are checked before your pull request (PR) is ready to be reviewed and merged. Thanks!

• tests pass -- look for a green checkbox ✔️ a few minutes after opening your PR -- or run tests locally with npm test
• code is in uniquely-named feature branch and has no merge conflicts
• PR is descriptively titled
• ask @publiclab/is-reviewers for help, in a comment below

0 value is now mapped to 1 as the || operator makes it to 100 and also using 0 will lead to an infinite loop. Also now negetive values will also not lead to infinite loop.

[codecov]

Codecov Report

Merging #1205 into main will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1205   +/-   ##
=======================================
  Coverage   55.11%   55.11%           
=======================================
  Files         117      117           
  Lines        2344     2344           
  Branches      360      360           
=======================================
  Hits         1292     1292           
  Misses       1052     1052

[jywarren]

This looks good - is it ready to merge? Thank you!

[jywarren]

Merged! Thank you!