"--stats scan" gives misleading statistics (analyze is fine)

[tstromberg]

When you use --stats with scan, you can't get an idea of your hit rate as HIGH+CRIT always totals 100%. My guess is that it's because we drop misses before stat generation.

For example:

📊 Statistics
---
Files Scanned   10781 (0 skipped)
Total Risks     10781
---
⚠️  Risk Level Percentage
---
Risk Level    Percentage Count/Total
4/CRIT            89.46% 9645/10781
3/HIGH            10.54% 1136/10781
---
Number of behaviors      15758

[egibs]

Yep, we return an empty file report in report.Generate when running a scan:

if c.Scan && overallRiskScore < HIGH {
	return malcontent.FileReport{}, nil
}

I'll reason about a fix for this.