Remove obsolete sprintf from ExecutableNotFoundException callback

[ghost]

Q	A
Branch	master
Bug fix?	yes
New feature?	no
BC breaks?	no
Deprecations?	no
Documented?	no
Fixed tickets

When Grumphp throws an ExecutableNotFoundException via the ExternalCommand class it executes sprintf twice because the Exception contains the sprintf as well.. This was probably introduced during refactoring of the Exception. This pull request just removes the obsolete sprintf.

grumphp/src/Exception/ExecutableNotFoundException.php

Line 12 in 0e6287a

sprintf('The executable for "%s" could not be found.', $command)

Example of output before:

phpmd
=====

The executable for "The executable for "phpmd" could not be found." could not be found.

Example of output after:

phpmd
=====

The executable for "phpmd" could not be found.

[veewee]

Thanks!