Fix comment cancel button

Add type="button" to avoid submitting the form by clicking on cancel, that's not what we want

incidents/templates/events/detail-all.html

@@ -238,7 +238,7 @@ <h4 id="addCommentLabel" class="modal-title">{% trans "Add comment" %}</h4>
 					  	</div>
 
 						<div class="modal-footer">
-							<button class="btn btn-default" data-bs-dismiss="modal" aria-hidden="true">{%  trans "Cancel" %}</button>
+							<button type="button" class="btn btn-default" data-bs-dismiss="modal" aria-hidden="true">{%  trans "Cancel" %}</button>
 							<button type="submit" class="btn btn-primary">{%  trans "Save changes" %}</button>
 					  	</div>
 					</form>