Add support for L5.5 & 5.6

[conroyp]

The docs currently list support for Laravel versions 5.5 and 5.6, but because of a dependency on callable array syntax functionality in the action function, any error triggered on a 5.5 or 5.6 app falls back to the old-style whoops screen (https://github.com/facade/ignition/issues/20).

This PR changes the action call into the ShareReportController to the uglier, older style until such a time as support for 5.5 and 5.6 is officially dropped.

There's a similar action() call in this file also relying on the callable syntax, for telescope logging. That has been left alone here - it doesn't need to change as telescope itself has a minimum version of 5.7, where this problem no longer exists.

[freekmurze]

Thanks!