Fix missing trailing newline in .ghaignore

POSIX text files should end with a newline. The missing newline could
cause issues with tools that concatenate or process the file line by
line (e.g. the grep/tr pipeline in the CI workflows).

Author: rocketiotemp

.github/.ghaignore

@@ -64,4 +64,4 @@ tokens/escrow/steel
 tokens/pda-mint-authority/steel
 tokens/spl-token-minter/steel
 tokens/token-swap/steel
-tokens/transfer-tokens/steel
+tokens/transfer-tokens/steel