fix 3 javac warnings: redundant cast
see GitHub issue #561 for context
[javac] /home/thk/git/yacy_search_server/source/net/yacy/htroot/ConfigAccounts_p.java:85: warning: [cast] redundant cast to YaCyHttpServer
[javac] final YaCyHttpServer jhttpserver = (YaCyHttpServer)sb.getHttpServer();
[javac] ^
[javac] /home/thk/git/yacy_search_server/source/net/yacy/htroot/ConfigUser_p.java:156: warning: [cast] redundant cast to YaCyHttpServer
[javac] final YaCyHttpServer jhttpserver = (YaCyHttpServer) sb.getHttpServer();
[javac] ^
[javac] /home/thk/git/yacy_search_server/source/net/yacy/htroot/ConfigUser_p.java:167: warning: [cast] redundant cast to YaCyHttpServer
[javac] final YaCyHttpServer jhttpserver = (YaCyHttpServer) sb.getHttpServer();
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