Proxy Borrower: Make student name field readonly

The field should be readonly because the system uses it as prefilled.

Closes: ADA-51

Author: awilfox

app/views/proxy_borrower_forms/dsp_form.html.erb

@@ -13,7 +13,7 @@
     below to withdraw books in my name for use in research. I will take full responsibility 
     for all materials checked out with this card in my name.
   </p>
-  <%= field_for f, :student_name, required: true %>
+  <%= field_for f, :student_name, required: true, readonly: true %>
   <%= field_for f, :research_last, required: true %>
   <%= field_for f, :research_first, required: true %>
   <%= field_for f, :research_middle %>