Review request for JMC-65577: Thread lanes on Threads page are not persisted

[Klara Ward]

Please review my fix for JMC 7.1.0

Bug: https://bugs.openjdk.java.net/browse/JMC-6557

Since this is oneline fix, just including the diff below

// klaraw

===================================
diff --git 
a/application/org.openjdk.jmc.flightrecorder.ui/src/main/java/org/openjdk/jmc/flightrecorder/ui/pages/ThreadsPage.java 
b/application/org.openjdk.jmc.flightrecorder.ui/src/main/java/org/openjdk/jmc/flightrecorder/ui/pages/ThreadsPage.java 

--- 
a/application/org.openjdk.jmc.flightrecorder.ui/src/main/java/org/openjdk/jmc/flightrecorder/ui/pages/ThreadsPage.java
+++ 
b/application/org.openjdk.jmc.flightrecorder.ui/src/main/java/org/openjdk/jmc/flightrecorder/ui/pages/ThreadsPage.java
@@ -326,6 +326,7 @@
                 public void saveTo(IWritableState state) {
                         super.saveTo(state);
tableFilterComponent.saveState(state.createChild(THREADS_TABLE_FILTER));
+                       lanes.saveTo(state);
                         saveToLocal();
                 }