Remove literal used in condition

The right syntax would have been:

`after_save :recalculate_heading_winners, if: :incompatible_changed?`

However, since the method `recalculate_heading_winners` already executes
the `if incompatible_changed?` condition, removing it keeps the intended
behaviour.

app/models/budget/investment.rb

@@ -95,7 +95,7 @@ class Budget
     scope :for_render, -> { includes(:heading) }
 
     before_save :calculate_confidence_score
-    after_save :recalculate_heading_winners if :incompatible_changed?
+    after_save :recalculate_heading_winners
     before_validation :set_responsible_name
     before_validation :set_denormalized_ids