In config make booleans checks with saved value non case sensitive

It could be that in the setting file we have "true" and then this string
is compared with "True" that indicates that value was changed. By making
boolean compatisions non case sensitive this is resolved.

lib/python/Components/config.py

@@ -556,6 +556,11 @@ def trueValues(self):
 		# This should be set in the __init__() but has been done this way as a workaround for a stupid broken plugin that fails to call ConfigBoolean.__init__().
 		return ("1", "enable", "on", "true", "yes")
 
+	def isChanged(self):
+		#Make booleans checks with saved value non case sensitive
+		sv = self.saved_value or self.tostring(self.default)
+		strv = self.tostring(self.value)
+		return strv.lower() != sv.lower()
 
 class ConfigEnableDisable(ConfigBoolean):
 	def __init__(self, default=False, graphic=True):