feat(form): conditionally display max top-up amount

Amolith created 

Remove range from the form, but pass max_top_up_amount through and only display
it if the user isn't tombed.

Change summary

forms/top_up.rb                | 5 ++++-
lib/buy_account_credit_form.rb | 2 +-
2 files changed, 5 insertions(+), 2 deletions(-)

Detailed changes

forms/top_up.rb 🔗 

@@ -1,6 +1,10 @@
 form!
 title "Buy Account Credit"
 
+if @max_top_up_amount & @max_top_up_amount.positive?
+	instructions "Max amount: $#{@max_top_up_amount}"
+end
+
 field(
 	type: "fixed",
 	label: "Current balance",
@@ -11,7 +15,6 @@ field(**@payment_methods.to_list_single)
 
 field(
 	datatype: "xs:decimal",
-	range: @range,
 	var: "amount",
 	label: "Amount of credit to buy",
 	prefix: "$",

lib/buy_account_credit_form.rb 🔗 

@@ -50,7 +50,7 @@ class BuyAccountCreditForm
 			:top_up,
 			balance: @balance,
 			payment_methods: @payment_methods,
-			range: [15, @max_top_up_amount]
+			max_top_up_amount: @max_top_up_amount
 		)
 	end