Remove == method from drops from testing to_liquid_value

Since they could cause tests to pass without to_liquid_value being called
on the left side of the equality comparison.

test/test_helper.rb

@@ -131,10 +131,6 @@ class IntegerDrop < Liquid::Drop
     @value = value.to_i
   end
 
-  def ==(other)
-    @value == other
-  end
-
   def to_s
     @value.to_s
   end
@@ -150,10 +146,6 @@ class BooleanDrop < Liquid::Drop
     @value = value
   end
 
-  def ==(other)
-    @value == other
-  end
-
   def to_liquid_value
     @value
   end