patch 9.0.0059: test file has wrong name

Problem:    Test file has wrong name.
Solution:   Rename the file.  Various small fixes. (closes #10674)
diff --git a/src/vim.h b/src/vim.h
index a4da185..eeeeb69 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -2819,7 +2819,7 @@
 #define UC_BUFFER	1	// -buffer: local to current buffer
 #define UC_VIM9		2	// {} argument: Vim9 syntax.
 
-// flags used by vim_strsave_escaped()
+// flags used by vim_strsave_fnameescape()
 #define VSE_NONE	0
 #define VSE_SHELL	1	// escape for a shell command
 #define VSE_BUFFER	2	// escape for a ":buffer" command