fix: SHOW_DEBUG_BACKTRACE does not work in web

Author: kenjis

app/Views/errors/html/error_exception.php

@@ -44,6 +44,7 @@
         <?php endif; ?>
     </div>
 
+    <?php if (defined('SHOW_DEBUG_BACKTRACE') && SHOW_DEBUG_BACKTRACE) : ?>
     <div class="container">
 
         <ul class="tabs" id="tabs">
@@ -375,14 +376,16 @@
         </div>  <!-- /tab-content -->
 
     </div> <!-- /container -->
+    <?php endif; ?>
 
     <div class="footer">
         <div class="container">
 
             <p>
                 Displayed at <?= esc(date('H:i:sa')) ?> &mdash;
                 PHP: <?= esc(PHP_VERSION) ?>  &mdash;
-                CodeIgniter: <?= esc(CodeIgniter::CI_VERSION) ?>
+                CodeIgniter: <?= esc(CodeIgniter::CI_VERSION) ?> --
+                Environment: <?= ENVIRONMENT ?>
             </p>
 
         </div>