Fixing Keeper of Isengard errata fierce not applying until regroup

gemp-lotr/gemp-lotr-async/src/main/web/cards/set51/set03-errata.json

@@ -96,7 +96,8 @@
         "effect": {
           "type": "addKeyword",
           "filter": "choose(uruk-hai)",
-          "keyword": "fierce"
+          "keyword": "fierce",
+          "until": "start(regroup)"
         }
       },
     ]

gemp-lotr/gemp-lotr-server/src/test/java/com/gempukku/lotro/cards/unofficial/pc/errata/set3/Saruman_KoIErrataTests.java

@@ -110,5 +110,7 @@ public class Saruman_KoIErrataTests
         assertEquals(0, scn.GetWoundsOn(uruk1));
         assertEquals(1, scn.GetWoundsOn(saruman));
 
+        scn.SkipToPhase(Phase.ASSIGNMENT);
+        assertTrue(scn.HasKeyword(uruk1, Keyword.FIERCE));
     }
 }