Fix spec for InitiateSystemShutdownExA, as pointed out by Stefan
Leichter.

diff --git a/dlls/advapi32/advapi32.spec b/dlls/advapi32/advapi32.spec
index 821ce23..71d4f47 100644
--- a/dlls/advapi32/advapi32.spec
+++ b/dlls/advapi32/advapi32.spec
@@ -134,7 +134,7 @@
 @ stdcall InitializeSid(ptr ptr long)
 @ stub InitiateSystemShutdownA
 @ stub InitiateSystemShutdownW
-@ stdcall InitiateSystemShutdownExA(wstr wstr long long long long)
+@ stdcall InitiateSystemShutdownExA(str str long long long long)
 @ stdcall InitiateSystemShutdownExW(wstr wstr long long long long)
 @ stub InstallApplication
 @ stub IsProcessRestricted