Put the FX reclaimer to sleep on a project-state load instead of waking it

abandon() clears the wakeup where invalidate() raises it, so File > Revert
cannot converge FX or spend park records against a model nothing re-read.

src/shell/view/fx_reclaim.cpp

@@ -281,9 +281,9 @@ void fxReclaimLabelUndoSpan(const char* label, int mask) {
 void fxReclaimEndUndoSpan() { closeSpan(); }
 
 void fxReclaimAbandonForStateLoad() {
-    // Close FIRST and unconditionally. The abandon below only stops future writes; the
-    // block is what a Ctrl-Z would otherwise close over the wrong state, and it is open
-    // whether or not a drain is on the stack at all.
+    // Close FIRST and unconditionally. The abandon below stops the drain and puts the loop
+    // to sleep; the block is what a Ctrl-Z would otherwise close over the wrong state, and
+    // it is open whether or not a drain is on the stack at all.
     closeSpan();
     g_queue.abandon();
 }