winebuy.sys: Add heuristic for typical Virpil user configurations

Some games support a maximum of 32, 50 or 64 buttons specifically, thus
we're seeing HOTAS configurations out there which are adjusted to show
exactly that amount of buttons.

Let's add it as a heuristic for Virpil game controllers.

Link: ValveSoftware/Proton#6839 (comment)

dlls/winebus.sys/unixlib.c

@@ -127,12 +127,18 @@ static BOOL is_virpil_controller(WORD vid, WORD pid, INT buttons)
     switch (vid)
     {
     case 0x03eb:
+        /* users may have configured button limits, usually 32/50/64 */
+        if ((buttons == 32) || (buttons == 50) || (buttons == 64)) return TRUE;
+
         if (pid == 0x2055) return TRUE; /* ATMEL/VIRPIL/200325 VPC Throttle MT-50 CM2 */
         break;
     case 0x3344:
         /* comes with 31 buttons in the default configuration, or 128 max */
         if ((buttons == 31) || (buttons == 128)) return TRUE;
 
+        /* users may have configured button limits, usually 32/50/64 */
+        if ((buttons == 32) || (buttons == 50) || (buttons == 64)) return TRUE;
+
         /* if customized, arbitrary amount of buttons may be shown, decide by PID */
         if (pid == 0x412f) return TRUE; /* Virpil Constellation ALPHA-R */
         if (pid == 0x812c) return TRUE; /* Virpil Constellation ALPHA-L */