Updated default db configuration to use explicit relative path
Updated default db configuration to use explicit relative path

Problem: After the commit 45e1288acf67d64030242341d097714db7052fc5 applied,
h2 doesn't work if the application uses implisit relative path for the db's url.

Solution: I've changed the default configuration example's db url to use explicit path.

brainagenet/yobi,yona-projects/yona,naver/yobi,yona-projects/yona,doortts/fork-yobi,bloodybear/yona,bloodybear/yona,doortts/forked-for-history,brainagenet/yobi,bloodybear/yona,ihoneymon/yobi,yona-projects/yona,oolso/yobi,ihoneymon/yobi,Limseunghwan/oss,doortts/fork-yobi,brainagenet/yobi,doortts/fork-yobi,oolso/yobi,oolso/yobi,ahb0327/yobi,ihoneymon/yobi,doortts/fork-yobi,doortts/forked-for-history,Limseunghwan/oss,ahb0327/yobi,naver/yobi,yona-projects/yona,ahb0327/yobi,bloodybear/yona,Limseunghwan/oss,naver/yobi,doortts/forked-for-history