fix: resolve hashcat binary path from hcatPath + hcatBin

When hcatBin is a relative name (e.g. "hashcat"), construct the full
path by joining hcatPath and hcatBin so the correct hashcat binary is
used instead of relying on PATH resolution.

config.json.example

@@ -1,5 +1,5 @@
 {
-  "hcatPath": "/path/to/hate_crack",
+  "hcatPath": "/path/to/hashcat",
   "hcatBin": "hashcat",
   "hcatTuning": "--force --remove",
   "hcatPotfilePath": "~/.hashcat/hashcat.potfile",