Fix clippy::large_enum_variant lint in cosmic-text example (#811)

Signed-off-by: Nico Burns <[email protected]>

Author: nicoburns

Diff for: examples/cosmic_text/src/main.rs

@@ -45,6 +45,7 @@ impl CosmicTextContext {
     }
 }
 
+#[allow(clippy::large_enum_variant)]
 enum NodeContext {
     Text(CosmicTextContext),
     Image(ImageContext),