Fix saving/loading an angle unit (degree sign) used in expression #258
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This fix is for the issue #237
With this modification, the degree sign will be saved as "\u00b0" instead of "°" in the scene file.
This fix will keep the compatibility between Toonz Harlequin's scene file.
Please note that this fix will not enable to load the scene file saved with the previous version of OpenToonz.