Removes "preview" flag from pre-releases

This is because the marketplace doesn't know about pre-releases and our versioning model makes the latest pre-release always the latest version (which is what shows on the marketplace)

scripts/applyPreReleasePatch.js

@@ -18,7 +18,6 @@ packageJSON = JSON.stringify(
 		version: `${String(date.getFullYear())}.${date.getMonth() + 1}.${date.getDate()}${String(
 			date.getHours(),
 		).padStart(2, '0')}`,
-		preview: true,
 	},
 	undefined,
 	'\t',