Increase tmpfs size for dumping Bisq blockchain data

Currently, it requires about 5.2G of space.
Therefore, increase it to allow for future growth.
However, hopefully this becomes irrelevant soon
with the changes in bisq-network/mempool#13.

seednode/bisq.service

@@ -35,7 +35,7 @@ ExecStart=/bin/bash __BISQ_HOME__/__BISQ_REPO_NAME__/${BISQ_ENTRYPOINT} \
 ExecStop=/bin/kill ${MAINPID} ; sleep 5
 Restart=on-failure
 
-ExecStartPre=+/bin/bash -c "if [ $BISQ_DUMP_BLOCKCHAIN = true ];then mkdir -p $BISQ_HOME/$BISQ_APP_NAME/$BISQ_BASE_CURRENCY/db/json && mount -t tmpfs none -o size=5000M,uid=bisq,gid=bisq $BISQ_HOME/$BISQ_APP_NAME/$BISQ_BASE_CURRENCY/db/json;else true;fi"
+ExecStartPre=+/bin/bash -c "if [ $BISQ_DUMP_BLOCKCHAIN = true ];then mkdir -p $BISQ_HOME/$BISQ_APP_NAME/$BISQ_BASE_CURRENCY/db/json && mount -t tmpfs none -o size=8000M,uid=bisq,gid=bisq $BISQ_HOME/$BISQ_APP_NAME/$BISQ_BASE_CURRENCY/db/json;else true;fi"
 ExecStopPost=+/bin/bash -c "if [ $BISQ_DUMP_BLOCKCHAIN = true ];then umount $BISQ_HOME/$BISQ_APP_NAME/$BISQ_BASE_CURRENCY/db/json;else true;fi"
 
 User=bisq