patch tests to work with G::L::D v0.090 or earlier [ Alternative to previous pull request ]

Hi Maros

I have found another workaround to MooseX::App not installing on platforms with Getopt::Long::Descriptive v0.090 or earlier. This commit just patches the test instead of introducing an extra dependency. Maybe you like this solution better than the other one.


Regards
Edward

---git commit messag
The particular error message "Mandatory parameter '...' missing" has
changed in Getopt::Long::Descriptive between versions 0.090 and 0.091.
This commit patches MooseX::App's tests to allow for both versions of
the error message, allowing installs on platforms with a version of
G::L::D inferior to 0.091. Note that MooseX::App does not depend on
G::L::D directly.