ceph: Remove leaveDotGit as it is non-deterministic

pkgs/tools/filesystems/ceph/0.80.nix

···
   src = fetchgit {
     url = "git://github.com/ceph/ceph.git";
     rev = "refs/tags/v${version}";
-    leaveDotGit = true;
-    sha256 = "0s81j6yj8y27hlx1hid9maz0l7bhjjskjxzxlhsikzmdc1j27m4r";
+    sha256 = "1arajccczjdqp7igs17569xlq5cj4azcm5wwixg6ryypjr2grcbl";
   };
 
   patches = [

pkgs/tools/filesystems/ceph/0.94.nix

···
   src = fetchgit {
     url = "https://github.com/ceph/ceph.git";
     rev = "refs/tags/v${version}";
-    leaveDotGit = true;
-    sha256 = "094f9knxgx8vb9fb1yzld9ib4m0wpqwqgqjl3xqf0dzm48nxqd73";
+    sha256 = "1nhqzmxv7bz93b8rbd88wgmw9icm2lhmc94dfscgh23kfpipyd6l";
   };
 
   patches = [

pkgs/tools/filesystems/ceph/dev.nix

···
   src = fetchgit {
     url = "https://github.com/ceph/ceph.git";
     rev = "refs/tags/v${version}";
-    leaveDotGit = true;
-    sha256 = "13iyv53kq2ka5py759cdiw0wmzpsycskvhmyr74qkpxmw9g6177y";
+    sha256 = "0kydjyvb1566mh33p6dlljfx1r4cfdj8ic4i19h5r9vavkc46nf0";
   };
 
   patches = [ ./fix-pythonpath.patch ];