SelectFileWidget: Simplify CSS selector specificity
SelectFileWidget: Simplify CSS selector specificity

Simplifying CSS selector specificity by removing unnecessary
`input`/`textarea` selector from already higher specific
`.oo-ui-pendingElement-pending`.

Change-Id: I69ffade82e64f095d794cadf67ee0e48dbe31142

wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui