Make size-output fixed length in pg_basebackup verbose mode

This way the line doesn't shift right as the amount of data processed
increases.

src/bin/pg_basebackup/pg_basebackup.c

@@ -432,9 +432,10 @@ progress_report(int tablespacenum, const char *filename)
 			 * call)
 			 */
 			fprintf(stderr,
-					ngettext("%s/%s kB (100%%), %d/%d tablespace %*s",
-							 "%s/%s kB (100%%), %d/%d tablespaces %*s",
+					ngettext("%*s/%s kB (100%%), %d/%d tablespace %*s",
+							 "%*s/%s kB (100%%), %d/%d tablespaces %*s",
 							 tablespacecount),
+					strlen(totalsize_str),
 					totaldone_str, totalsize_str,
 					tablespacenum, tablespacecount,
 					VERBOSE_FILENAME_LENGTH + 5, "");
@@ -443,9 +444,10 @@ progress_report(int tablespacenum, const char *filename)
 			bool truncate = (strlen(filename) > VERBOSE_FILENAME_LENGTH);
 
 			fprintf(stderr,
-					ngettext("%s/%s kB (%d%%), %d/%d tablespace (%s%-*.*s)",
-							 "%s/%s kB (%d%%), %d/%d tablespaces (%s%-*.*s)",
+					ngettext("%*s/%s kB (%d%%), %d/%d tablespace (%s%-*.*s)",
+							 "%*s/%s kB (%d%%), %d/%d tablespaces (%s%-*.*s)",
 							 tablespacecount),
+					strlen(totalsize_str),
 					totaldone_str, totalsize_str, percent,
 					tablespacenum, tablespacecount,
 					/* Prefix with "..." if we do leading truncation */
@@ -458,9 +460,10 @@ progress_report(int tablespacenum, const char *filename)
 	}
 	else
 		fprintf(stderr,
-				ngettext("%s/%s kB (%d%%), %d/%d tablespace",
-						 "%s/%s kB (%d%%), %d/%d tablespaces",
+				ngettext("%*s/%s kB (%d%%), %d/%d tablespace",
+						 "%*s/%s kB (%d%%), %d/%d tablespaces",
 						 tablespacecount),
+				strlen(totalsize_str),
 				totaldone_str, totalsize_str, percent,
 				tablespacenum, tablespacecount);