Move log_listener call into the reboot trap (flutter#16564)

Author: George Wright

testing/fuchsia/run_tests.sh

@@ -25,6 +25,11 @@ else
 fi
 
 reboot() {
+  echo "Dumping system logs..."
+
+  ./fuchsia_ctl -d $device_name ssh \
+      -c "log_listener --dump_logs yes"
+
   # note: this will set an exit code of 255, which we can ignore.
   ./fuchsia_ctl -d $device_name ssh -c "dm reboot-recovery" || true
 }
@@ -69,7 +74,3 @@ done
     -t shell_tests \
     -a "--gtest_filter=-ShellTest.HandlesActualIphoneXsInputEvents:ShellTest.CacheSkSLWorks:ShellTest.SetResourceCacheSize*:ShellTest.Screenshot:ShellTest.WaitForFirstFrameTimeout"
 
-echo "Dumping system logs..."
-
-./fuchsia_ctl -d $device_name ssh \
-    -c "log_listener --dump_logs yes"