qga-win: Increase VSS freeze timeout to 60 secs instead of 10

Currently Requester freeze times out after 10 seconds, while
the default timeout for Writer Freeze is 60 seconds. according to
VSS Documentation [1].
[1]: https://docs.microsoft.com/en-us/windows/win32/vss/overview-of-processing-a-backup-under-vss

Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=1909073

Signed-off-by: Basil Salman <bsalman@daynix.com>
Signed-off-by: Basil Salman <basil@daynix.com>
Signed-off-by: Michael Roth <michael.roth@amd.com>

qga/vss-win32/requester.cpp

@@ -18,7 +18,7 @@
 #include <inc/win2003/vsbackup.h>
 
 /* Max wait time for frozen event (VSS can only hold writes for 10 seconds) */
-#define VSS_TIMEOUT_FREEZE_MSEC 10000
+#define VSS_TIMEOUT_FREEZE_MSEC 60000
 
 /* Call QueryStatus every 10 ms while waiting for frozen event */
 #define VSS_TIMEOUT_EVENT_MSEC 10