Rename createDefault selector to newDefault

[tinchodias]

Two occurrences:

https://github.com/pharo-contributions/taskit/blob/a2c520791918c2a34b2fdb85f500bdd2f02b35f6/TaskIt/TKTCommonQueueWorkerPool.class.st#L21

https://github.com/pharo-contributions/taskit/blob/a2c520791918c2a34b2fdb85f500bdd2f02b35f6/TaskIt/TKTWorker.class.st#L41

[tinchodias]

There are more more to rename:

(SystemNavigation default allMethods
	select: [ :each | each package name beginsWith: 'TaskIt' ])
	select: [ :each | each selector beginsWith: 'create' ]

"
- TKTCommonQueueWorkerPool class>>#createDefault
- TKTPharoProcessProvider>>#createProcessDoing:named:
- TKTPharoProcessProvider>>#createProcessDoing: 
- TKTProcessProvider>>#createProcessDoing:named: 
- TKTProcessProvider>>#createProcessDoing: 
- TKTProcessProvider class>>#createProcessDoing:named: 
- TKTProcessProvider class>>#createProcessDoing: 
- TKTWorker class>>#createDefault)
"