plugins/overseer: fix strategy option

Actually supports a table to customize the strategy.

plugins/by-name/overseer/default.nix

@@ -14,7 +14,9 @@ lib.nixvim.neovim-plugin.mkNeovimPlugin {
   maintainers = [ lib.maintainers.khaneliman ];
 
   settingsOptions = {
-    strategy = defaultNullOpts.mkStr "terminal" ''
+    strategy =
+      defaultNullOpts.mkNullableWithRaw (with types; either str (attrsOf anything)) "terminal"
+        ''
           Default task strategy.
         '';
 

tests/test-sources/plugins/by-name/overseer/default.nix

@@ -174,4 +174,21 @@
       };
     };
   };
+
+  example = {
+    plugins.overseer = {
+      enable = true;
+
+      settings = {
+        strategy = {
+          __unkeyed-1 = "toggleterm";
+          use_shell = false;
+          close_on_exit = false;
+          quit_on_exit = "never";
+          open_on_start = true;
+          hidden = false;
+        };
+      };
+    };
+  };
 }