[Fix] Do not ignore short words

MFH: rspamd-1.6

src/libserver/cfg_utils.c

@@ -37,7 +37,7 @@
 #define DEFAULT_RLIMIT_MAXCORE 0
 #define DEFAULT_MAP_TIMEOUT 60.0 * 5
 #define DEFAULT_MAP_FILE_WATCH_MULTIPLIER 1
-#define DEFAULT_MIN_WORD 4
+#define DEFAULT_MIN_WORD 0
 #define DEFAULT_MAX_WORD 40
 #define DEFAULT_WORDS_DECAY 200
 #define DEFAULT_MAX_MESSAGE (50 * 1024 * 1024)