Fixing verification assessment in plot_heatmap

Removed the verification check for the columns finalX and finalY from the plot_heatmap function.

Checklist

Before creating the Pull-Request, I...

[x] Ran devtools::document() and Install and Restart.
[x] Ran devtools::check() (GHA will do this but doesn't hurt to check yourself).
[x] (If applicable) Checked changes made to website with pkgdown::build_site().
[x] Wrote commit message(s) throughout the time spent working on this branch with clear details of changes made.
[x] Updated package version with usethis::use_version() (choosing one of "major", "minor", "patch", "dev" options) and wrote down changes made in NEWS.md
[x] (If applicable) Created new tests for new functions or changes made to existing functions (Check codecov).

After all of the Github Actions Checks have finished, I...

[x] Checked lintr issues by going to the latest commit or the Checks tab.
[x] Used Squash & Merge option.
[ ] Wrote in detail of all the changes made in the various commits on this branch.
[ ] Added a keyword like closes #56, fixes #123 at the end of the message.
[x] Merged the Pull-Request.
[ ] Deleted the branch.

abhiamishra / ggshakeR