Use the correct path when generating the command-line on Windows.

We already constructed it in the code via blaze_util::AsShortWindowsPath, but accidentally didn't use the results.

--
PiperOrigin-RevId: 149398556
MOS_MIGRATED_REVID=149398556
diff --git a/src/main/cpp/blaze_util_windows.cc b/src/main/cpp/blaze_util_windows.cc
index 9f6aecb..4e72092 100644
--- a/src/main/cpp/blaze_util_windows.cc
+++ b/src/main/cpp/blaze_util_windows.cc
@@ -387,7 +387,7 @@
     if (first) {
       first = false;
       // Skip first argument, instead use quoted executable name.
-      cmdline << '\"' << exe << '\"';
+      cmdline << '\"' << short_exe << '\"';
       continue;
     } else {
       cmdline << ' ';