5.3.1

Added a Mela Lab preset group which will be used to demo Mela Lab module features.
Added Demo 5.3 preset to the group.
Mela Lab modules no longer incorrectly display the flask icon when not expanded.
Fixed the preset overwrite confirmation dialog sometimes dismissing itself, preventing saving the preset.
Fixed the incorrect alignment of the close button of the About screen when Mela zoom was set to a value other than 100%.