ui: update banner shows the build number, not GRIM's frozen 0.3.6

The 'Update is available' fallback row rendered crate::VERSION (CARGO_PKG_VERSION = GRIM's 0.3.6) as the current version, e.g. '0.3.6 > build131' — a mismatched, GRIM-leaking string. Show the Goblin build number: 'build130 > build131'.

src/gui/views/wallets/content.rs

@@ -847,7 +847,7 @@ impl WalletsContent {
 					let ver_text = if let Some(size) = update.size.as_ref() {
 						format!("{} {} ({} MB)", BOOKMARKS, update.version, size)
 					} else {
-						format!("{} {} > {}", BOOKMARKS, crate::VERSION, update.version)
+						format!("{} build{} > {}", BOOKMARKS, crate::BUILD, update.version)
 					};
 					View::ellipsize_text(ui, ver_text, 15.0, Colors::text(false));
 					ui.add_space(1.0);