tests: Fix a failing test.

Update the test point for f3410c5862 (#264),
which changed the highlighting of aliases to consider what they resolve to.

Now the test file has both ${aliases[alias1]} and ${functions[alias1]},
the expectation is 'alias', and passes; thus:

Fixes #588.

highlighters/main/test-data/alias.zsh

@@ -27,7 +27,7 @@
 # vim: ft=zsh sw=2 ts=2 et
 # -------------------------------------------------------------------------------------------------
 
-alias alias1="unused expansion"
+alias alias1="ls"
 alias -s alias2="echo"
 function alias1() {} # to check that it's highlighted as an alias, not as a function
 
@@ -47,5 +47,5 @@ if zmodload -e zsh/parameter || [[ "$(type -w x.alias2)" == *suffix* ]]; then
 fi
 expected_region_highlight+=(
   "9 9 commandseparator" # ;
-  "11 16 alias 'issue #558'" # alias1
+  "11 16 alias" # alias1
 )