user32/tests: Fix test failure on Win7.

dlls/user32/tests/input.c

@@ -78,7 +78,7 @@ static struct {
 static UINT (WINAPI *pSendInput) (UINT, INPUT*, size_t);
 static int (WINAPI *pGetMouseMovePointsEx) (UINT, LPMOUSEMOVEPOINT, LPMOUSEMOVEPOINT, int, DWORD);
 
-#define MAXKEYEVENTS 10
+#define MAXKEYEVENTS 12
 #define MAXKEYMESSAGES MAXKEYEVENTS /* assuming a key event generates one
                                        and only one message */