feat(cops): clean rubocop run

1. ignoring one file because it's an intentional vuln
2. made a few small semantic changes, but verified that they're equivalent.

app/controllers/sessions_controller.rb

@@ -13,7 +13,8 @@ class SessionsController < ApplicationController
     begin
       # Normalize the email address, why not
       user = User.authenticate(params[:email].to_s.downcase, params[:password])
-      rescue Exception => e
+    rescue RuntimeError => e
+      # don't do ANYTHING
     end
 
     if user
@@ -25,7 +26,7 @@ class SessionsController < ApplicationController
       redirect_to path
     else
       flash[:error] = e.message
-      render "new"
+      render "sessions/new"
     end
   end