Aaron Jorbin ee0ef3ca36 Use px instead of in in device preview
Devices are not consistent in how they handle `in` units. `in` was an attempt to cleverly disguise the exact size of the 'tablet'. The PHP code standards mentions avoiding clever code ( https://make.wordpress.org/core/handbook/best-practices/coding-standards/php/#clever-code ) but we should extend that idea to the css code as well.

Props celloexpressions
Fixes #36457


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