Make tables for DEFINE_STRING_TABLE_LOOKUP consistent

Bring some arrays that are used for DEFINE_STRING_TABLE_LOOKUP() in the
same order than the enums they reference.

Also, pass the corresponding _MAX value to the array initalizer where
appropriate.

src/shared/log.c

@@ -967,7 +967,7 @@ bool log_on_console(void) {
         return syslog_fd < 0 && kmsg_fd < 0 && journal_fd < 0;
 }
 
-static const char *const log_target_table[] = {
+static const char *const log_target_table[_LOG_TARGET_MAX] = {
         [LOG_TARGET_CONSOLE] = "console",
         [LOG_TARGET_KMSG] = "kmsg",
         [LOG_TARGET_JOURNAL] = "journal",