test: add boltz fundingsource to regtest (#3677)

Co-authored-by: Vlad Stan <stan.v.vlad@gmail.com>

.env.example

@@ -18,7 +18,6 @@ ENABLE_LOG_TO_FILE=true
 # https://loguru.readthedocs.io/en/stable/api/logger.html#file
 LOG_ROTATION="100 MB"
 LOG_RETENTION="3 months"
-    
 # for database cleanup commands
 # CLEANUP_WALLETS_DAYS=90
 
@@ -187,7 +186,6 @@ BOLTZ_CLIENT_ENDPOINT=127.0.0.1:9002
 BOLTZ_CLIENT_MACAROON="/home/bob/.boltz/macaroons/admin.macaroon"
 # HEXSTRING instead of path also possible
 BOLTZ_CLIENT_CERT="/home/bob/.boltz/tls.cert"
-BOLTZ_CLIENT_WALLET="lnbits"
 
 # StrikeWallet
 STRIKE_API_ENDPOINT=https://api.strike.me/v1
@@ -333,4 +331,3 @@ LNBITS_RESERVE_FEE_PERCENT=1.0
 ######################################
 ###### Logging and Development #######
 ######################################
-