gpui: Don't panic on failing to set X11 cursor style (#21689)

One more panic (well, two) that should be a `log_err`.

Release Notes:

- N/A

crates/util/src/util.rs

@@ -206,6 +206,9 @@ pub trait ResultExt<E> {
     /// Assert that this result should never be an error in development or tests.
     fn debug_assert_ok(self, reason: &str) -> Self;
     fn warn_on_err(self) -> Option<Self::Ok>;
+    fn anyhow(self) -> anyhow::Result<Self::Ok>
+    where
+        E: Into<anyhow::Error>;
 }
 
 impl<T, E> ResultExt<E> for Result<T, E>
@@ -243,6 +246,13 @@ where
             }
         }
     }
+
+    fn anyhow(self) -> anyhow::Result<T>
+    where
+        E: Into<anyhow::Error>,
+    {
+        self.map_err(Into::into)
+    }
 }
 
 fn log_error_with_caller<E>(caller: core::panic::Location<'_>, error: E, level: log::Level)