platedetector: Change type of plate-width-percentage from int to float
platedetector: Change type of plate-width-percentage from int to float

Change-Id: I7b99af240b23100ed1d246b7e8e2017190eb8a20

dfernandezlop/kms-platedetector,shelsonjava/kms-platedetector,shelsonjava/kms-platedetector,Kurento/kms-platedetector,dfernandezlop/kms-platedetector,dfernandezlop/kms-platedetector,shelsonjava/kms-platedetector,Kurento/kms-platedetector,Kurento/kms-platedetector