[Fix] Fix url_suspect plugin causing massive false positives

[Fix] Fix url_suspect plugin causing massive false positives

The url_suspect plugin had multiple critical issues:

1. R_SUSPICIOUS_URL triggered on every message with URLs, adding 25 points
   due to incorrect dynamic score usage (5.0 * 5.0 instead of 1.0 * 5.0)

2. Broken compat_mode inserted R_SUSPICIOUS_URL without URL info whenever
   ANY url check triggered, making it impossible to debug

3. Symbol names were unnecessarily configurable, adding complexity

4. url_suspect_group.conf was not included in groups.conf, so scores
   were not loaded at all

Fixed by:
- Removed R_SUSPICIOUS_URL and compat_mode completely
- Fixed all insert_result() calls to use 1.0 dynamic weight
- Made symbol names hardcoded constants
- Added url group to groups.conf with max_score = 9.0
- Cleaned up score configuration parameters