Extend .log-table header fix to the other left-aligned activity tables

mmdvmhost/localtx.php and dstarrepeater/last_herd.php + local_tx.php
share the exact same pattern as mmdvmhost/lh.php (fixed in e8a569a7 /
2bc8f7b0): every data row is align="left" but headers inherited the
sitewide centered table text-align, so captions visually drift from
their column's actual content.

Deliberately did NOT touch dstarrepeater/active_starnet_groups.php's
two tables - checked their td alignment first and both are mostly
align="center" (only one column/cell is left-aligned in each), so
their headers already match their data; adding .log-table there would
have broken the columns that were already correct.

mmdvmhost/localtx.php

@@ -29,7 +29,7 @@ if ($callsignLookupSvc == "QRZ") { $callsignLookupUrl = "https://www.qrz.com/db/
 
 ?>
 <b><?php echo $lang['local_tx_list'];?></b>
-  <table>
+  <table class="log-table">
     <tr>
       <th><a class="tooltip" href="#"><?php echo $lang['time'];?> (<?php echo date('T')?>)<span><b>Time in <?php echo date('T')?> time zone</b></span></a></th>
       <th><a class="tooltip" href="#"><?php echo $lang['mode'];?><span><b>Transmitted Mode</b></span></a></th>