Fix migration v141 (#14387)

* Fix mig 141

* Add Migration to fix it

* update null values to false first

* Alter Table if posible

* use dropTableColumns instead of recreateTable

* MySQL use Alter

* Postgres use Alter

* Update models/migrations/v167.go

* Apply suggestions from code review

* use 2x add col & 2x update & 2x drop col

* let sqlite be the only issue

* use recreate since it just WORKS

models/migrations/v141.go

@@ -12,7 +12,7 @@ import (
 
 func addKeepActivityPrivateUserColumn(x *xorm.Engine) error {
 	type User struct {
-		KeepActivityPrivate bool
+		KeepActivityPrivate bool `xorm:"NOT NULL DEFAULT false"`
 	}
 
 	if err := x.Sync2(new(User)); err != nil {