Set the tabIndex on the input element
Set the tabIndex on the input element

This commit reverts a portion of the changes introduced in
9eac520e6a369882827ac637e31dbd24804cf44b. Prior to that commit, we were
setting the tabIndex to -1 on the atom-text-editor element. This commit
restores that behavior.

Instead of setting a custom tab index directly on the atom-text-editor
element, we instead set the tabIndex on the input element *inside* the
atom-text-editor element.

With these changes in place, you can successfully use the tabIndex to
define the tab order for atom-text-editor elements. 😅

stinsonga/atom,t9md/atom,PKRoma/atom,ardeshirj/atom,stinsonga/atom,andrewleverette/atom,ardeshirj/atom,atom/atom,Arcanemagus/atom,atom/atom,PKRoma/atom,liuderchi/atom,liuderchi/atom,ardeshirj/atom,liuderchi/atom,brettle/atom,andrewleverette/atom,Arcanemagus/atom,Mokolea/atom,brettle/atom,t9md/atom,PKRoma/atom,atom/atom,t9md/atom,Mokolea/atom,brettle/atom,Mokolea/atom,Arcanemagus/atom,stinsonga/atom,liuderchi/atom,andrewleverette/atom,stinsonga/atom