MAINT: fix depreciated formt usage in nonlinear_color_mapping #892
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After the update of the traitsui package, RangeEditor has deprecated the usage of format_str. Some code that didn't adapt to the change has raised error during the test such as mentioned in #888 .
The error is located in https://github.com/enthought/chaco/blob/main/chaco/examples/demo/nonlinear_color_mapping.py#L198, and the current PR fixes it by updating the deprecated "format" to "format_str". Closes #888