Fix DEFAULT_REMOTE_ICON character code

Unicode characters with code longer than 4 digits should be written as
`\Uffffffff` (8 digits)

Fixes #4652

pkg/gui/presentation/icons/git_icons.go

@@ -12,7 +12,7 @@ var (
 	TAG_ICON                     = "\uf02b"     // 
 	COMMIT_ICON                  = "\U000f0718" // 󰜘
 	MERGE_COMMIT_ICON            = "\U000f062d" // 󰘭
-	DEFAULT_REMOTE_ICON          = "\uf02a2"    // 󰊢
+	DEFAULT_REMOTE_ICON          = "\U000f02a2" // 󰊢
 	STASH_ICON                   = "\uf01c"     // 
 	LINKED_WORKTREE_ICON         = "\U000f0339" // 󰌹
 	MISSING_LINKED_WORKTREE_ICON = "\U000f033a" // 󰌺