Images resizeAndSave should fallback to config.upload.formatOptions

[khakimvinh]

Hi all,

ref: src/uploads/imageResizer.ts > resizeAndSave

Currently resizeAndSave only check for formatOptions in each desiredSize, if not specified, the function will simply skip and go back to use JPG even with config.upload.formatOptions declared.

This is not really a bug but I would suggest falling back to use config.upload.formatOptions if exists before using default, would be more convenience when only 1 format option needed.