do not write bandwise WAVELENGTH and WAVELENGTH_UNITS metedata when viewing spectral profiles

e.g. \enmap-box\enmapboxtestdata\enmap_berlin.bsq.aux.xml

<PAMRasterBand band="12">
  <Description>band 19 (0.513000 Micrometers)</Description>
  <NoDataValue>-9.90000000000000E+01</NoDataValue>
  <Metadata>
    <MDI key="wavelength">0.513000</MDI>
    <MDI key="wavelength_units">Micrometers</MDI>
  </Metadata>
</PAMRasterBand>

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