Module Management red box text and constraints

[willgearty]

As of right now, we say:

ESP-Website/esp/templates/program/modules/admincore/modules.html

Lines 37 to 38 in 7c1ed01

	<li>The Credit Card Module must always be last <i>and</i> cannot be required</li>
	<li>The Confirm Registration Module cannot be required</li>

But it looks like we actually always make the credit card module second to last (seq 10000) and the confirm module last (seq 99999). I imagine I meant to set the credit card seq to 100000, but just misread the confirm module's seq value. However, maybe it makes sense to have the confirm module always last and the credit card module always second to last? Either way, we'll need to update the behavior and/or the text here.