Increase AnimationPlayer position SpinBox to fit more decimals

Fixed UI bug where it appeared that pushing the up or down incrementing
arrows did not increment the SpinBox value appropriately. Just needed
to increase the size of the box horizontally, to display four decimal
points consistently.

(cherry picked from commit 09658f7e3ba7ffc87ae9f90aa42f64dfeeb33f40)

editor/plugins/animation_player_editor_plugin.cpp

@@ -1562,7 +1562,7 @@ AnimationPlayerEditor::AnimationPlayerEditor(EditorNode *p_editor, AnimationPlay
 
 	frame = memnew(SpinBox);
 	hb->add_child(frame);
-	frame->set_custom_minimum_size(Size2(60, 0));
+	frame->set_custom_minimum_size(Size2(80, 0) * EDSCALE);
 	frame->set_stretch_ratio(2);
 	frame->set_step(0.0001);
 	frame->set_tooltip(TTR("Animation position (in seconds)."));