Revert "[gdb/testsuite] Handle missing curses in gdb.python/py-missing-debug.exp"

This reverts commit 29c7078711.

After the previous commit 29c7078711 should no longer be
needed as the curses dependency has been removed.

gdb/testsuite/gdb.python/py-missing-debug.exp

@@ -58,21 +58,8 @@ with_test_prefix "initial checks" {
 }
 
 # Load the Python script into GDB.
-set python_script_loaded 0
-set re_no_curses [string_to_regexp "Module 'curses' is not installed."]
-gdb_test_multiple "source $remote_python_file" "source python script" {
-    -re -wrap $re_no_curses.* {
-	unsupported $gdb_test_name
-    }
-    -re -wrap "^Success" {
-	set python_script_loaded 1
-	pass $gdb_test_name
-    }
-}
-
-if { ! $python_script_loaded } {
-    return
-}
+gdb_test "source $remote_python_file" "^Success" \
+    "source python script"
 
 # Setup the separate debug info directory.  This isn't actually needed until
 # some of the later tests, but might as well get this done now.