patch 9.1.1500: if_python: typo in python error variable

Problem:  if_python: typo in python error variable
Solution: fix typo (Damien Lejay)

closes: #17640

Signed-off-by: Damien Lejay <damien@lejay.be>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/errors.h b/src/errors.h
index 042ab28..6ca05b5 100644
--- a/src/errors.h
+++ b/src/errors.h
@@ -2303,7 +2303,7 @@
 	INIT(= N_("E886: Can't rename viminfo file to %s!"));
 #endif
 #if defined(FEAT_PYTHON) || defined(FEAT_PYTHON3)
-EXTERN char e_sorry_this_command_is_disabled_python_side_module_could_not_be_loaded[]
+EXTERN char e_sorry_this_command_is_disabled_python_site_module_could_not_be_loaded[]
 	INIT(= N_("E887: Sorry, this command is disabled, the Python's site module could not be loaded."));
 #endif
 EXTERN char e_nfa_regexp_cannot_repeat_str[]