fix: hide preview action in split mode

[sanjaysargam]

Purpose / Description

Preview action was appearing twice in the toolbar menu.This happened because the menu items were only removed when both conditions were true

Fixes

• Fixes Productionize 'Side-by-side browser and editor' #20206

Approach

Switched to || so menu items are removed as soon as either condition met

How Has This Been Tested?

Chromebook

Checklist

Please, go through these checks before submitting the PR.

• You have a descriptive commit message with a short title (first line, max 50 chars).
• You have commented your code, particularly in hard-to-understand areas
• You have performed a self-review of your own code
• UI changes: include screenshots of all affected screens (in particular showing any new or changed strings)
• UI Changes: You have tested your change using the Google Accessibility Scanner

[david-allison]

• this should be blocked on #20208

See the commit message on e606599 regarding duplicated IDs

Once that PR is merged, we want to go back to the the drawing board here: previewing the edited changes on a card is a useful feature which this PR removes for users in tablet mode. [if the dev setting is toggled]

After the correct course of action is determined, needs a couple more tests regarding what the menus look like when there's no selected rows.

EDIT: The correct course of action can be to merge, and move the discussion point to #20206

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Wait... this doesn't fix the linked issue

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