app_voicemail: use a consistent generator string

When updating voicemail.conf when a user changes
their pin, change the generator string to be the
same as the module name when reading so that the
same config_hook will be called.

Review: https://reviewboard.asterisk.org/r/3837/
........

Merged revisions 419284 from http://svn.asterisk.org/svn/asterisk/branches/11


git-svn-id: https://origsvn.digium.com/svn/asterisk/certified/branches/11.6@419308 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_voicemail.c

@@ -1749,7 +1749,7 @@ static void vm_change_password(struct ast_vm_user *vmu, const char *newpassword)
 				ast_test_suite_event_notify("PASSWORDCHANGED", "Message: voicemail.conf updated with new password\r\nPasswordSource: voicemail.conf");
 				reset_user_pw(vmu->context, vmu->mailbox, newpassword);
 				ast_copy_string(vmu->password, newpassword, sizeof(vmu->password));
-				ast_config_text_file_save(VOICEMAIL_CONFIG, cfg, "AppVoicemail");
+				ast_config_text_file_save(VOICEMAIL_CONFIG, cfg, "app_voicemail");
 				ast_config_destroy(cfg);
 				break;
 			}
@@ -1792,7 +1792,7 @@ static void vm_change_password(struct ast_vm_user *vmu, const char *newpassword)
 				ast_test_suite_event_notify("PASSWORDCHANGED", "Message: users.conf updated with new password\r\nPasswordSource: users.conf");
 				reset_user_pw(vmu->context, vmu->mailbox, newpassword);
 				ast_copy_string(vmu->password, newpassword, sizeof(vmu->password));
-				ast_config_text_file_save("users.conf", cfg, "AppVoicemail");
+				ast_config_text_file_save("users.conf", cfg, "app_voicemail");
 			}
 
 			ast_config_destroy(cfg);