GridSize changes when applying a preset

[partha120804]

Description

When grid sizes are set below 30 the Preset applying was not as expected. Fixed the bug now applying a preset resets the grid size to 30.

Related Issue

Closes #302

Checklist

• [x] I have performed a self-review of my code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings

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[partha120804]

@EternoSeeker please review this PR

[EternoSeeker]

I think we can allow setting presets for sizes more than 30, it's just the smaller sizes that'll cause problems. since some presets would look nice in larger grids so we should allow for >= 30 but reset for sizes less than 30

[partha120804]

@EternoSeeker done, please check it