lib/model: Trigger pulls instead of pulling periodically

GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/4340

lib/config/folderconfiguration.go

@@ -42,7 +42,6 @@ type FolderConfiguration struct {
 	Order                 PullOrder                   `xml:"order" json:"order"`
 	IgnoreDelete          bool                        `xml:"ignoreDelete" json:"ignoreDelete"`
 	ScanProgressIntervalS int                         `xml:"scanProgressIntervalS" json:"scanProgressIntervalS"` // Set to a negative value to disable. Value of 0 will get replaced with value of 2 (default value)
-	PullerSleepS          int                         `xml:"pullerSleepS" json:"pullerSleepS"`
 	PullerPauseS          int                         `xml:"pullerPauseS" json:"pullerPauseS"`
 	MaxConflicts          int                         `xml:"maxConflicts" json:"maxConflicts"`
 	DisableSparseFiles    bool                        `xml:"disableSparseFiles" json:"disableSparseFiles"`