Quick/Bulk Edit: Restore compact size of inline edit select

[t-hamano]

Trac ticket: https://core.trac.wordpress.org/ticket/64685

The height of elements in the Quick Edit UI was unified to 32px by r61827. However, subsequent changes in r62171 unintentionally removed the line-height not only from input elements but also from select elements. As a result, the following styles were applied to select elements, causing their height to unintentionally revert to 40px.

.wp-core-ui select {
	line-height: 2.71428571; /* 38px for 40px min-height */
}

This PR restores the appropriate line-height value to achieve the 32px height.

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[mukeshpanchal27]

Do we need to add a note for future reference so this doesn’t get removed again?

[t-hamano]

Do we need to add a note for future reference so this doesn’t get removed again?

Nice idea, addressed in #92bc76698d8c45eaf2d9eae60fceefb5d64152d2

P.S. I also propose removing hardcoded line-height values from all select elements in the future, as it can sometimes be difficult to predict the final element height. However, we need to confirm that removing the line-height does not cause any issues. See https://core.trac.wordpress.org/ticket/62864#comment:23