numeric.rb: add parentheses to block.call

added parentheses to block.call where the return value is used.

Co-authored-by: Claude <noreply@anthropic.com>

mrblib/numeric.rb

@@ -74,7 +74,7 @@ class Integer
 
     i = 0
     while i < self
-      block.call i
+      block.call(i)
       i += 1
     end
     self