Replace hard tabs with spaces in .rb files

config/danbooru_default_config.rb

@@ -174,23 +174,23 @@ module Danbooru
     # How long pending posts stay in the modqueue before being deleted.
     def moderation_period
       3.days
-		end
+    end
 
-		# Upload points can be earned or lost by users. They punish and reward users by adding and removing upload slots.
-		# 1000 points is enough for 10 uploads. See app/logical/upload_limit.rb for details on the level system.
-		def initial_upload_points
-			1000
-		end
+    # Upload points can be earned or lost by users. They punish and reward users by adding and removing upload slots.
+    # 1000 points is enough for 10 uploads. See app/logical/upload_limit.rb for details on the level system.
+    def initial_upload_points
+      1000
+    end
 
-		# The cap on how many upload points a user can earn.
-		def maximum_upload_points
-			10_000
-		end
+    # The cap on how many upload points a user can earn.
+    def maximum_upload_points
+      10_000
+    end
 
-		# These slots are added to the ones earned by upload levels and guaranteed to all users, even those at level 0.
-		def extra_upload_slots
-			5
-		end
+    # These slots are added to the ones earned by upload levels and guaranteed to all users, even those at level 0.
+    def extra_upload_slots
+      5
+    end
 
     # https://guides.rubyonrails.org/action_mailer_basics.html#action-mailer-configuration
     # https://guides.rubyonrails.org/configuring.html#configuring-action-mailer