Shop badge discount: fix Spender, add Roller disc.

The shop discount from Big Spender badges was incorrectly implemented:
intended behavior was for 2pp per badge. However, the values in
const.py were set as if a user could only have one Spender badge at
once, while user.py @ discount was implemented as if they were
additive. Since users factually do have multiple big spender badges,
the values in const were adjusted to reflect this fact.

Also, lootbox Roller badges now each offer a 1pp discount.
users.py @ discount was improved to check against the `discounts`
keys for appropriate badges, rather than a hardcoded list.

files/classes/user.py

@@ -192,7 +192,7 @@ class User(Base):
 		elif self.patron == 6: discount = 0.65
 		else: discount = 1
 
-		for badge in [69,70,71,72,73]:
+		for badge in discounts:
 			if self.has_badge(badge): discount -= discounts[badge]
 
 		return discount

files/helpers/const.py

@@ -721,11 +721,16 @@ REDDIT_NOTIFS = {
 }
 
 discounts = {
+	# Big Spender badges, 2pp additive discount each
 	69: 0.02,
-	70: 0.04,
-	71: 0.06,
-	72: 0.08,
-	73: 0.10,
+	70: 0.02,
+	71: 0.02,
+	72: 0.02,
+	73: 0.02,
+	# Lootbox badges, 1pp additive discount each
+	76: 0.01,
+	77: 0.01,
+	78: 0.01,
 }
 
 CF_KEY = environ.get("CF_KEY", "").strip()