chore(lieer): Remove OAuth client patch

This is now done in my work-specific configuration, which is
elsewhere.

third_party/lieer/api_client.patch

@@ -1,20 +0,0 @@
-diff --git a/lieer/remote.py b/lieer/remote.py
-index 6e3973a..62728f7 100644
---- a/lieer/remote.py
-+++ b/lieer/remote.py
-@@ -25,12 +25,12 @@ class Remote:
-   # * https://stackoverflow.com/questions/19615372/client-secret-in-oauth-2-0?rq=1
-   #
-   OAUTH2_CLIENT_SECRET = {
--        "client_id":"753933720722-ju82fu305lii0v9rdo6mf9hj40l5juv0.apps.googleusercontent.com",
--        "project_id":"capable-pixel-160614",
-+        "client_id":"945192553054-84bml3hfvv0floml1natqc4cribs0tmt.apps.googleusercontent.com",
-+        "project_id":"tazjins-lieer-project",
-         "auth_uri":"https://accounts.google.com/o/oauth2/auth",
-         "token_uri":"https://accounts.google.com/o/oauth2/token",
-         "auth_provider_x509_cert_url":"https://www.googleapis.com/oauth2/v1/certs",
--        "client_secret":"8oudEG0Tvb7YI2V0ykp2Pzz9",
-+        "client_secret":"${CLIENT_SECRET}",
-         "redirect_uris":["urn:ietf:wg:oauth:2.0:oob", "http://localhost"]
-     }
- 

third_party/lieer/default.nix

@@ -7,18 +7,7 @@
 
 with pkgs.third_party;
 
-let
+python3Packages.buildPythonApplication rec {
-  # My employer does not allow third-party projects to use our email
-  # accounts, but I want to use lieer for it anyways.
-  #
-  # To accomplish this the following derivation creates a patch that
-  # replaces the API client with one that I control.
-  authPatch = runCommand "client_secret.patch" {} ''
-    export PATH=${lib.makeBinPath [ gettext ]}:$PATH
-    export CLIENT_SECRET='${builtins.getEnv "LIEER_CLIENT_SECRET"}'
-    cat ${./api_client.patch} | envsubst > $out
-  '';
-in python3Packages.buildPythonApplication rec {
   name = "lieer-${version}";
   version = "1.0";
 
@@ -29,8 +18,6 @@ in python3Packages.buildPythonApplication rec {
     sha256 = "1zzylv8xbcrh34bz0s29dawzcyx39lai8y8wk0bl4x75v1jfynvf";
   };
 
-  patches = [ authPatch ];
-
   propagatedBuildInputs = with python3Packages; [
     notmuch
     oauth2client