wxGUI/image2target: fix showing Ground Control Points settings dialog #3189
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Describe the bug
Showing Map Georectifier and Ground Control Points manager for 3D correction tool settings dialog fails and prints an error message.
To Reproduce
Steps to reproduce the behavior:
g.gui.image2target
Expected behavior
Showing Map Georectifier and Ground Control Points manager for 3D correction tool settings dialog should work and not printing an error message.
System description:
Additional context
Only horizontal alignment flags can be used in vertical sizers.