crostini: Fix a copy/paste error

We were checking for the wrong signal name. In practise we get both or
neither signal but still good to clean up.

Bug: None
Test: CQ
Change-Id: Ibe93fe677c9359454e1cd6a88a5c8d3ade9dd199
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2567053
Auto-Submit: David Munro <davidmunro@google.com>
Reviewed-by: Fergus Dall <sidereal@google.com>
Commit-Queue: Fergus Dall <sidereal@google.com>
Cr-Commit-Position: refs/heads/master@{#832198}

chrome/browser/chromeos/crostini/crostini_manager.cc

@@ -1215,7 +1215,7 @@ void CrostiniManager::StartLxd(std::string vm_name,
     std::move(callback).Run(CrostiniResult::CLIENT_ERROR);
     return;
   }
-  if (!GetCiceroneClient()->IsLxdContainerStartingSignalConnected()) {
+  if (!GetCiceroneClient()->IsStartLxdProgressSignalConnected()) {
     LOG(ERROR) << "Async call to StartLxd can't complete when signals "
                   "are not connected.";
     std::move(callback).Run(CrostiniResult::CLIENT_ERROR);