fix:更新输入长度

xxl-job-admin/src/main/resources/templates/jobgroup/jobgroup.index.ftl

                         </div>
                         <div class="form-group">
                             <label for="lastname" class="col-sm-2 control-label">${I18n.jobgroup_field_title}<font color="red">*</font></label>
-                            <div class="col-sm-10"><input type="text" class="form-control" name="title" placeholder="${I18n.system_please_input}${I18n.jobgroup_field_title}" maxlength="12" ></div>
+                            <div class="col-sm-10"><input type="text" class="form-control" name="title" placeholder="${I18n.system_please_input}${I18n.jobgroup_field_title}" maxlength="50" ></div>
                         </div>
                         <div class="form-group">
                             <label for="lastname" class="col-sm-2 control-label">${I18n.jobgroup_field_order}<font color="red">*</font></label>