Remove unnecessary jelly conditional code (jenkinsci#94)

The configuration form modernization happened in Jenkins 2.277.1.
This plugin requires at least Jenkins 2.361.4.  The divBasedFormLayout
conditional will always be true.  Inline the <div> tags rather than
using a conditional.

src/main/resources/org/jenkinsci/plugins/conditionalbuildstep/ConditionalBuilder/config.jelly

@@ -1,5 +1,5 @@
 <?jelly escape-by-default='true'?>
-<j:jelly xmlns:j="jelly:core" xmlns:st="jelly:stapler" xmlns:d="jelly:define" xmlns:l="/lib/layout" xmlns:t="/lib/hudson" xmlns:f="/lib/form" xmlns:cb="/lib/conditionalbuildstep">
+<j:jelly xmlns:j="jelly:core" xmlns:st="jelly:stapler" xmlns:d="jelly:define" xmlns:l="/lib/layout" xmlns:t="/lib/hudson" xmlns:f="/lib/form">
 
 	<f:entry>
 		<f:dropdownDescriptorSelector title="${%condition}" field="runCondition" descriptors="${descriptor.runConditions}" />
@@ -13,14 +13,14 @@
 	<f:block>
 		<div style="padding-left: 2em">
 			<fieldset style="margin-bottom:1em">
-				<cb:blockWrapper>
+				<div>
 					<f:section title="${%stepssection}">
 						<f:nested>
 							<f:hetero-list name="conditionalbuilders" hasHeader="true" descriptors="${descriptor.getBuilderDescriptors(it)}" items="${instance.conditionalbuilders}"
 								addCaption="${%Add step to condition}" />
 						</f:nested>
 					</f:section>
-				</cb:blockWrapper>
+				</div>
 			</fieldset>
 		</div>
 	</f:block>