IDEA-152678 lst: allow to initialize tracker multiple times

this is required in case if base revesion was changed - LineStatusTrackerManager.refreshTracker()

it was broken in 2cbc4f0

platform/vcs-impl/src/com/intellij/openapi/vcs/ex/LineStatusTracker.java

@@ -124,7 +124,7 @@ public class LineStatusTracker {
 
     synchronized (myLock) {
       try {
-        if (myInitialized || myReleased) return;
+        if (myReleased) return;
         if (myBaseRevisionNumber != null && myBaseRevisionNumber.contains(baseRevisionNumber)) return;
 
         myBaseRevisionNumber = baseRevisionNumber;