difftastic fixes

Author: macalinao

nix/home/common.nix

@@ -131,8 +131,12 @@
     };
   };
 
-  programs.difftastic.git = {
-    diffToolMode = true;
+  programs.difftastic = {
+    enable = true;
+    git = {
+      enable = true;
+      diffToolMode = true;
+    };
   };
 
   programs.delta = {