go: discord/backend: Use Minecraft username as fallback for member search

GoBot/discord/backend/members.go

@@ -6,6 +6,7 @@ import (
 
 	"github.com/bwmarrin/discordgo"
 
+	"TerraOceanBot/db"
 	"TerraOceanBot/discord/config"
 )
 
@@ -59,5 +60,17 @@ func GetMemberFromUserFriendlyName(s *discordgo.Session, user string) (*discordg
 			return v, nil
 		}
 	}
+	for _, v := range allMembers {
+		mcUsername, err := db.GetMinecraftUsername(v.User.ID)
+		if err == db.ErrNotFound {
+			continue
+		}
+		if err != nil {
+			return nil, err
+		}
+		if mcUsername == user {
+			return v, nil
+		}
+	}
 	return nil, ErrMemberNotFound
 }