revert data attribute

{% macro spectro_panel() %}

<form id="form-spectro" autocomplete="off">

  <div class="row g-2">

    <div class="col-12">

      <label class="small text-muted">Type</label>

  <fieldset class="row g-2">

    <label class="col-md-2 col-form-label">Type</label>

    <div class="col-md">

      <select class="form-select form-select-sm bg-black" name="imagetype"

              data-telemetry-init="camera2-imagetype">

        <option value="Light">Light</option>

        <option value="Bias">Bias</option>

      </select>

    </div>

  </div>

  </fieldset>

</form>

{% endmacro %}

{% macro echelle_panel() %}

<div id="mode-panel-echelle" class="mode-panel d-none">

  <div class="card mb-3">

    <div class="card-body text-center py-5">

      <p class="text-muted mb-1">Échelle</p>

      <small class="text-secondary">Not yet implemented.</small>

    </div>

<form id="form-spectro" autocomplete="off">

  <fieldset class="row g-2">

    <label class="col-md-2 col-form-label">Type</label>

    <div class="col-md">

      <select class="form-select form-select-sm bg-black" name="imagetype"

              data-telemetry-init="camera3-imagetype">

        <option value="Light">Light</option>

        <option value="Bias">Bias</option>

        <option value="Flat">Flat</option>

        <option value="Dark">Dark</option>

      </select>

    </div>

    <label class="col-md-2 col-form-label">Filter</label>

    <div class="col-md">

      <select class="form-select form-select-sm bg-black" name="filter"

              data-telemetry-init="camera3-filter">

        <option value="FREE">Free</option>

      </select>

    </div>

  </fieldset>

</form>

{% endmacro %}