Replace map_or with is_none_or to satisfy clippy

Author: pjungkamp

gio/src/gio_future.rs

@@ -115,7 +115,7 @@ where
             && self
                 .receiver
                 .as_ref()
-                .map_or(true, |receiver| receiver.is_terminated())
+                .is_none_or(|receiver| receiver.is_terminated())
     }
 }
 

glib/src/source_futures.rs

@@ -101,7 +101,7 @@ where
             && self
                 .source
                 .as_ref()
-                .map_or(true, |(_, receiver)| receiver.is_terminated())
+                .is_none_or(|(_, receiver)| receiver.is_terminated())
     }
 }
 
@@ -313,7 +313,7 @@ where
             && self
                 .source
                 .as_ref()
-                .map_or(true, |(_, receiver)| receiver.is_terminated())
+                .is_none_or(|(_, receiver)| receiver.is_terminated())
     }
 }