Update canvas preprocessor for new MacOSX backend #151
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This fixes a bug with the macOS backend in upcoming matplotlib 3.3. The newest version actually fixes an issue with automatic figure resizing (matplotlib/matplotlib#15131) but proplot's canvas preprocessor had a bug that prevented this fix from working.
This also removes an unnecessary exit condition created for the qt backend back when I was overriding
draw_idle
rather thandraw
.