fix(ledger): test code panics when built in release mode

retrieving a stack trace must be run at comptime? i just put a null check to deal with it, instead of unwrapping the optional.

src/ledger/database.zig

@@ -28,7 +28,7 @@ pub fn testDatabase(comptime Impl: fn ([]const ColumnFamily) type) !void {
  }
  err = e;
  std.debug.print("\n\u{001B}[35m{s}\u{001B}[0m\n\n", .{decl.name});
- std.debug.dumpStackTrace(@errorReturnTrace().?.*);
+ if (@errorReturnTrace()) |trace| std.debug.dumpStackTrace(trace.*);
  };
  }
  if (err) |e| {