Remove copy/paste error

bisq-exchange.spec.in

@@ -25,7 +25,6 @@ The decentralized bitcoin exchange https://bisq.network
     {
         echo '#!/bin/sh'
         echo 'cd /opt/bisq-exchange'
-        echo 'exec /opt/bisq-exchange'
         echo 'exec java -jar gui/target/shaded.jar'
     } > bisq-exchange