fix typo error (missing </Product> at line 864)

---- Debugging information ----
message             :  : ParseError at [row,col]:[864,4]
Message: The element type "Product" must be terminated by the matching end-tag "</Product>".
cause-exception     : com.thoughtworks.xstream.io.StreamException
cause-message       :  : ParseError at [row,col]:[864,4]
Message: The element type "Product" must be terminated by the matching end-tag "</Product>".
class               : org.openhab.binding.zwave.internal.config.ZWaveDbProduct
required-type       : org.openhab.binding.zwave.internal.config.ZWaveDbProduct
converter-type      : com.thoughtworks.xstream.converters.reflection.ReflectionConverter
path                : /Manufacturers/Manufacturer[17]/Product
line number         : 864
class[1]            : org.openhab.binding.zwave.internal.config.ZWaveDbManufacturer
class[2]            : org.openhab.binding.zwave.internal.config.ZWaveProductDatabase$ZWaveDbRoot
version             : 1.4.6
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