More apache 2.4 variable syntax updates

oncampus.shtml

-wdnCampusCallback("<!--#if expr="$UNL_CAMPUS = 'on'" -->YES<!--#else -->NO<!--#endif -->");
+wdnCampusCallback("<!--#if expr="v('UNL_CAMPUS') = 'on'" -->YES<!--#else -->NO<!--#endif -->");
 

sharedcode/alert_new.shtml

 <!--#config timefmt="%Y%m%d%H" -->
-<!--#if expr="$DATE_LOCAL < 2008020600" -->
+<!--#if expr="v('DATE_LOCAL') < 2008020600" -->
 
 <!--you can use the preceding conditional to cease displaying the content at a given date and time; the opening line generates a ten-digit string as YYYYMMDDHH, where the hour is two-digit military time. From there, it's a simple matter of creating a static string in the same format for when you'd like the code to be hidden. Note the closing else and endifs at the bottom of this document.-->
 

sharedcode/alert_test.shtml

 <!--#config timefmt="%Y%m%d%H%M" -->
-<!--#if expr="(${DATE_LOCAL} >= 201302202200) && (${DATE_LOCAL} < 201302211000)" -->
+<!--#if expr="(v('DATE_LOCAL') >= 201302202200) && (v('DATE_LOCAL') < 201302211000)" -->
 <div style="border:2px solid #AF0909; border-radius: 5px; padding: 12px 9px 4px 9px;margin-bottom:9px;">
   	<span style="font-size: 10px;">INCLEMENT WEATHER ALERT ISSUED 4:30AM, FEB. 21, 2013</span><br />
   	<h3 style="color:#C60302;"><strong>UNL is Open Today</strong></h5>