fix: prevent extra padding in centered header cells when no buttons are displayed

[alessandrojcm]

Description

This PR fixes issue #414 where header cells with align: 'center' were not properly centered due to extra padding being added even when no buttons were displayed.

Problem

The issue was in the MRT_TableHeadCell component, where padding was being added based on the showColumnButtons condition, even when there were no actual buttons or actions to display. This caused centered header cells to appear off-center compared to body cells with the same alignment.

Solution

Modified the headerPL calculation to only add padding when there are actual buttons or actions to display:

// Before
if (showColumnButtons) pl += 1.75;

// After
if (showColumnButtons && (columnActionsEnabled || showDragHandle)) pl += 1.75;

closes #414

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