detect-flowbits: fix misleading indentation

detect-flowbits: fix misleading indentation

detect-flowbits.c: In function ‘FlowBitsTestSig02’:
detect-flowbits.c:475:4: warning: this ‘if’ clause does not guard... [-Wmisleading-indentation]
    if(error_count == 5)
    ^~
detect-flowbits.c:478:5: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘if’
     SigGroupBuild(de_ctx);
     ^~~~~~~~~~~~~