patch 8.2.1746: Vim9: cannot use "fina" for "finally"

Problem:    Vim9: Cannot use "fina" for "finally". (Naruhiko Nishino)
Solution:   Specifically check for "fina". (closes #7020)
diff --git a/src/testdir/test_vim9_script.vim b/src/testdir/test_vim9_script.vim
index 2f82b8d..0feb9fa 100644
--- a/src/testdir/test_vim9_script.vim
+++ b/src/testdir/test_vim9_script.vim
@@ -316,7 +316,7 @@
     endtry
   catch /wrong/
     add(l, 'caught')
-  finally
+  fina
     add(l, 'finally')
   endtry
   assert_equal(['1', 'caught', 'finally'], l)
@@ -526,7 +526,7 @@
 def ReturnFinally(): string
   try
     return 'intry'
-  finally
+  finall
     g:in_finally = 'finally'
   endtry
   return 'end'