xlogreader.c: Fix report_invalid_record translatability flag

For some reason I overlooked in GETTEXT_TRIGGERS that the right argument
be read by gettext in 7fcbf6a4.  This
will drop the translation percentages for the backend all the way back
to 9.3 ...

Problem reported by Heikki.

src/backend/nls.mk

@@ -4,7 +4,7 @@ AVAIL_LANGUAGES  = de es fr it ja pl pt_BR ru zh_CN
 GETTEXT_FILES    = + gettext-files
 GETTEXT_TRIGGERS = $(BACKEND_COMMON_GETTEXT_TRIGGERS) \
     GUC_check_errmsg GUC_check_errdetail GUC_check_errhint \
-    write_stderr yyerror parser_yyerror report_invalid_record
+    write_stderr yyerror parser_yyerror report_invalid_record:2
 GETTEXT_FLAGS    = $(BACKEND_COMMON_GETTEXT_FLAGS) \
     GUC_check_errmsg:1:c-format \
     GUC_check_errdetail:1:c-format \