mw.action.edit: Restore modifier keys for accesskey in tooltip for summary field

mw.action.edit: Restore modifier keys for accesskey in tooltip for summary field

.updateTooltipAccessKeys() is called automatically after the page
loads (from mediawiki.page.ready), but infusing the field blows away
these changes.

This is a poor workaround, the same issue will appear if e.g. the
buttons are infused. The functionality provided by jquery.accessKeyLabel
should be an OOjs UI feature, or we should somehow call it automatically
after infusing widgets.

Bug: T168042
Change-Id: I2b166be34b8394c296fbc7326570cd732284888f