pantheon.switchboard-plug-datetime: 2.1.5 -> 2.1.6

* drop clock-format.patch

pkgs/desktops/pantheon/apps/switchboard-plugs/datetime/clock-format.patch

@@ -1,12 +0,0 @@
-diff --git a/src/DateTime1.vala b/src/DateTime1.vala
-index 5a80fbd..2e1f948 100644
---- a/src/DateTime1.vala
-+++ b/src/DateTime1.vala
-@@ -38,6 +38,6 @@ public class DateTime.Settings : Granite.Services.Settings {
-     public string clock_format { get; set; }
- 
-     public Settings () {
--        base ("io.elementary.desktop.wingpanel.datetime");
-+        base ("io.elementary.granite");
-     }
- }

pkgs/desktops/pantheon/apps/switchboard-plugs/datetime/default.nix

@@ -16,13 +16,13 @@
 
 stdenv.mkDerivation rec {
   pname = "switchboard-plug-datetime";
-  version = "2.1.5";
+  version = "2.1.6";
 
   src = fetchFromGitHub {
     owner = "elementary";
     repo = pname;
     rev = version;
-    sha256 = "1iz8skf5dw76a07ljc8v8lw2x2nrmq8j6sggm227cmxy60gadsdv";
+    sha256 = "09734c3qc0296zf14rdhl4p6ppga015rz9hhsvlcc3nvyw7kdqkc";
   };
 
   passthru = {
@@ -51,8 +51,6 @@ stdenv.mkDerivation rec {
       src = ./timezone.patch;
       tzdata = "${tzdata}/share/zoneinfo/zone.tab";
     })
-    # Use "clock-format" GSettings key that's been moved to granite
-    ./clock-format.patch
   ];
 
   PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder "out"}/lib/switchboard";