Only show box for detailed info about migration steps when requested

Signed-off-by: Jon Stovell <jonstovell@gmail.com>

Author: Sesquipedalian

Themes/default/MaintenanceTemplate.php

@@ -311,7 +311,7 @@ protected static function showStepWithSubSteps(string $type, string $done_param)
 			<h3>', Lang::getTxt('upgrade_performing_substeps', ['type' => $type], file: 'Maintenance'), '</h3>
 			<h4><em>', Lang::getTxt('upgrade_please_be_patient', file: 'Maintenance'), '</em></h4>
 			<input type="hidden" name="', $done_param, '" id="', $done_param, '" value="0">
-			<div id="debug_section" class="bbc_code"><span id="debuginfo"></span></div>';
+			<div id="debug_section" class="bbc_code', !Maintenance::$tool->isDebug() ? ' hidden' : '', '"><span id="debuginfo"></span></div>';
 
 		echo '
 			<h3 id="current_tab">',