fixing the ternary operation where the logic is very confusing.

[#5136 state:resolved]
Signed-off-by: NJosé Valim <jose.valim@gmail.com>

actionpack/lib/action_view/helpers/date_helper.rb

@@ -800,7 +800,8 @@ def build_options(selected, options = {})
           start         = options.delete(:start) || 0
           stop          = options.delete(:end) || 59
           step          = options.delete(:step) || 1
-          leading_zeros = options.delete(:leading_zeros).nil? ? true : false
+          options.reverse_merge!({:leading_zeros => true})
+          leading_zeros = options.delete(:leading_zeros)
 
           select_options = []
           start.step(stop, step) do |i|