Fix unexpected termination by clicking run button. #120
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When TMP (default kidcode path) contains multi-byte character code, KidsRuby (Qt) fails to write kidcode.rb.
In addition, Qt::MessageBox::warning causes 'method_missing'.
Finally, KidsRuby is unexpectedly terminated by clicking Run button.
is addressed by force_encoding utf-8. 2) is addressed by passing nil instead of self.
Please review the code.