RemoteDB: don't spend time to close cursors on end of tx - server wil…

…l cleanup everything well (erigontech#2786)

go.mod

@@ -37,7 +37,7 @@ require (
 	github.com/json-iterator/go v1.1.12
 	github.com/julienschmidt/httprouter v1.3.0
 	github.com/kevinburke/go-bindata v3.21.0+incompatible
-	github.com/ledgerwatch/erigon-lib v0.0.0-20211005084142-9ac7ed8aa420
+	github.com/ledgerwatch/erigon-lib v0.0.0-20211006071738-9376dfdde3ef
 	github.com/ledgerwatch/log/v3 v3.3.1
 	github.com/ledgerwatch/secp256k1 v0.0.0-20210626115225-cd5cd00ed72d
 	github.com/logrusorgru/aurora/v3 v3.0.0

go.sum

@@ -499,8 +499,8 @@ github.com/kylelemons/godebug v0.0.0-20170224010052-a616ab194758 h1:0D5M2HQSGD3P
 github.com/kylelemons/godebug v0.0.0-20170224010052-a616ab194758/go.mod h1:B69LEHPfb2qLo0BaaOLcbitczOKLWTsrBG9LczfCD4k=
 github.com/leanovate/gopter v0.2.9 h1:fQjYxZaynp97ozCzfOyOuAGOU4aU/z37zf/tOujFk7c=
 github.com/leanovate/gopter v0.2.9/go.mod h1:U2L/78B+KVFIx2VmW6onHJQzXtFb+p5y3y2Sh+Jxxv8=
-github.com/ledgerwatch/erigon-lib v0.0.0-20211005084142-9ac7ed8aa420 h1:KwOjf+PJ/aM1wrobc00x1tR+SwbRe8MDjoPK0Qbm/bk=
-github.com/ledgerwatch/erigon-lib v0.0.0-20211005084142-9ac7ed8aa420/go.mod h1:R65M7eqckpbB9f4+WG6ftXVgPX2U1RhgrKE8lYgLzPI=
+github.com/ledgerwatch/erigon-lib v0.0.0-20211006071738-9376dfdde3ef h1:BMQK3YSFW0DwAgitU5AJ9/PXynS6a98Ups5TwanJbd0=
+github.com/ledgerwatch/erigon-lib v0.0.0-20211006071738-9376dfdde3ef/go.mod h1:R65M7eqckpbB9f4+WG6ftXVgPX2U1RhgrKE8lYgLzPI=
 github.com/ledgerwatch/log/v3 v3.3.1 h1:HmvLeTEvtCtqSvtu4t/a5MAdcLfeBcbIeowXbLYuzLc=
 github.com/ledgerwatch/log/v3 v3.3.1/go.mod h1:S3VJqhhVX32rbp1JyyvhJou12twtFwNEPESBgpbNkRk=
 github.com/ledgerwatch/secp256k1 v0.0.0-20210626115225-cd5cd00ed72d h1:/IKMrJdfRsoYNc36PXqP4xMH3vhW/8IQyBKGQbKZUno=