tools/mpy-tool.py: Initialize line_info_top.

Without it the line number mapping doesn't work.

Signed-off-by: Martin Milata <martin@martinmilata.cz>

tools/mpy-tool.py

@@ -936,6 +936,10 @@ class RawCode(object):
                 "        .line_info = fun_data_%s + %u,"
                 % (self.escaped_name, self.offset_line_info)
             )
+            print(
+                "        .line_info_top = fun_data_%s + %u,"
+                % (self.escaped_name, self.offset_closure_info)
+            )
             print(
                 "        .opcodes = fun_data_%s + %u," % (self.escaped_name, self.offset_opcodes)
             )