Keep the environment properly set. (#3072)

* Revert "fix prompts on startup (#3056)"

This reverts commit b202951c1d.

* Ensure environment variables synced with global internal Nu Scope.

crates/nu-data/src/config/nuconfig.rs

@@ -127,6 +127,10 @@ impl NuConfig {
             return Some(env_vars.clone());
         }
 
+        if let Some(env_vars) = vars.get("PATH") {
+            return Some(env_vars.clone());
+        }
+
         None
     }
 }