Revert "ldb: 1.1.27 -> 1.3.1"

This reverts commit bc474e2dd847776193678ef83143c92da4925d95.

Source hash is incorrect:

https://hydra.nixos.org/build/68234054

And even fixing it doesn't make it compile:

Checking for system tdb (>=1.3.15) : not found
ERROR: System library tdb of version 1.3.15 not found, and bundling disabled
builder for ‘/nix/store/bxnawxa402vrv4qmcmj2hmp98a0bz7li-ldb-1.3.1.drv’ failed with exit code 1
error: build of ‘/nix/store/bxnawxa402vrv4qmcmj2hmp98a0bz7li-ldb-1.3.1.drv’ failed

pkgs/development/libraries/ldb/default.nix

···
 }:
 
 stdenv.mkDerivation rec {
-  name = "ldb-1.3.1";
+  name = "ldb-1.1.27";
 
   src = fetchurl {
     url = "mirror://samba/ldb/${name}.tar.gz";
-    sha256 = "1b1mkggp8swb67s9aswavhzswlib34hpgsv66zgns009paf2df6d";
+    sha256 = "1b1mkl5p8swb67s9aswavhzswlib34hpgsv66zgns009paf2df6d";
   };
 
   outputs = [ "out" "dev" ];