integer was wrong padded§ length

or rather right (2 as should be and will be)
but currently we use next AND value + type means 3, rounded 4
because we can’t swap types at compile time (as is planned at runtime,
we use next OR value)

test/risc/test_interpreter.rb

@@ -52,7 +52,7 @@ module Risc
     end
     def test_pc1
       @interpreter.tick
-      assert_equal 18392 , @interpreter.pc
+      assert_equal 19224 , @interpreter.pc
     end
     def test_tick2
       @interpreter.tick
@@ -66,7 +66,7 @@ module Risc
     def test_pc2
       @interpreter.tick
       @interpreter.tick
-      assert_equal 18396 , @interpreter.pc
+      assert_equal 19228 , @interpreter.pc
     end
     def test_tick_14_jump
       14.times {@interpreter.tick}