Don't let user use ID7 on Apple quirks as it wont work

src/BlueSCSI.cpp

@@ -288,12 +288,20 @@ bool findHDDImages()
         strcat(fullname, name);
 
         // Check whether this SCSI ID has been configured yet
-        if (s2s_getConfigById(id))
+        const S2S_TargetCfg* cfg = s2s_getConfigById(id);
+        if (cfg)
         {
           log("-- Ignoring ", fullname, ", SCSI ID ", id, " is already in use!");
           continue;
         }
 
+        // Apple computers reserve ID 7, so warn the user this configuration wont work
+        if(id == 7 && cfg->quirks == S2S_CFG_QUIRKS_APPLE )
+        {
+          bluelog("-- Ignoring ", fullname, ", SCSI ID ", id, " Quirks set to Apple so can not use SCSI ID 7!");
+          continue;
+        }
+
         // Type mapping based on filename.
         // If type is FIXED, the type can still be overridden in .ini file.
         S2S_CFG_TYPE type = S2S_CFG_FIXED;