fix the bug of checkSpinnerValue
fix the bug of checkSpinnerValue

The user setting page sets the "Items Per Page" minimum or maximum value,
which affects the display of "Log Lines Per Instance"

Change-Id: I087412272257b665b6ac1de6ba5eabd06f011e74
Closes-Bug: #1803014

openstack/horizon,openstack/horizon,ChameleonCloud/horizon,noironetworks/horizon,ChameleonCloud/horizon,ChameleonCloud/horizon,openstack/horizon,NeCTAR-RC/horizon,NeCTAR-RC/horizon,noironetworks/horizon,ChameleonCloud/horizon,NeCTAR-RC/horizon,openstack/horizon,noironetworks/horizon,NeCTAR-RC/horizon,noironetworks/horizon