Use C style strings when checking for invalid alias characters

Before, the '\n' would be interpreted as 'n' meaning that any alias
who's command contained the letter 'n' would incorrect be skipped.

completion/available/aliases.completion.bash

@@ -50,7 +50,7 @@ function _bash-it-component-completion-callback-on-init-aliases() {
 		fi
 
 		# skip aliases to pipes, boolean control structures and other command lists
-		chars='\|\&\;\)\(\n\<\>'
+		chars=$'\|\&\;\)\(\n\<\>'
 		if [[ "${alias_defn}" =~ [$chars] ]]; then
 			continue
 		fi