Fixed tile_set_editor_plugin.cpp selection issue.
Fixed tile_set_editor_plugin.cpp selection issue.

Fixed issue where using arrows to change the selected tile would not reach all subtiles in an autotile, only going up to the second to last row and column.

ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot