When using AdditionalLayer, the legend of the main laer is shown and not from the additional layer. #720

  <Style name="georing-ir-rainbow-180-310-C" title="IR -33 - 7 Celsius" abstract="Style for GEO-RING channels IR 180-310 Kelvin">
    <Legend tickinterval="10">sat-rainbow-inversed</Legend>
    <ValueRange min="-10000" max="7.15"/>
    <Min>-33.15</Min>
    <Max>7.15</Max>
    <RenderMethod>nearest</RenderMethod>
  </Style>

  <Style name="georing-gray-clipped-C" title="auto-stretch" abstract="Style for GEO-RING channels - auto-stretch">
    <Legend tickinterval="2">gray</Legend>
    <Scale>0</Scale>
    <RenderMethod>nearest</RenderMethod>
    <Min>7.15</Min>
    <Max>40</Max>
  </Style>



  <Layer type="database">
    <Group value="MSG channels" />
    <Name force="true">MSG_scat_IR108-combined</Name>
    <Title>MSG SCAT IR 108 FULL DISC 24/7 sandwich</Title>
    <Variable units = "Temp (K)">data</Variable>
    <FilePath filter="^MSG_scat_IR108.*\.nc$" retentionperiod="{ADAGUCENV_RETENTIONPERIOD}" retentiontype="datatime">
      /data/adaguc-data/SAT_sandwich_opt_jun26/</FilePath>
    <Dimension name="time" interval="PT15M">time</Dimension>
    <Styles>georing-gray-clipped-C</Styles>
    <DataPostProc algorithm="convert_units" a="1" b="-273.15" units="degrees Celsius"/>
    <AdditionalLayer style="georing-ir-rainbow-180-310-C">MSG_scat_IR108_Celsius</AdditionalLayer>
  </Layer>