R1:40e9806e3c88

Remove the caret dropdown from transaction lists when no actions are available

Summary:
See PHI325. When a transaction group in Differential (or Pholio) only has an inline comment, it renders with a "V" caret but no actual dropdown menu.

This caret renders in a "disabled" color, but the color is "kinda grey". The "active" color is "kinda grey with a dab of blue". Here's what they look like today:

{F5401581}

Just remove it.

Test Plan: Viewed one of these, no longer saw the inactive caret.

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