Moved static_assert outside of vm_execute

Doesn't change much but is a bit more legible.

vm/runtime.c

@@ -54,13 +54,14 @@ const char *err_as_cstr(err_t err)
   }
 }
 
+static_assert(NUMBER_OF_OPCODES == 98, "vm_execute: Out of date");
+
 static_assert(DATA_TYPE_NIL == -1 && DATA_TYPE_WORD == 2,
               "Code using OPCODE_DATA_TYPE for quick same type opcode "
               "conversion may be out of date.");
 
 err_t vm_execute(vm_t *vm)
 {
-  static_assert(NUMBER_OF_OPCODES == 98, "vm_execute: Out of date");
   struct Program *prog = &vm->program;
   prog_t *program_data = prog->data;
   if (prog->ptr >= program_data->count)