Fix: Pass townnameparts as parameter when testing townname based companyname. (#11685)

Length of returned string could vary and pass/fail the length check with a different
string than the final selection.

src/company_cmd.cpp

@@ -374,6 +374,7 @@ verify_name:;
 			if (cc->name_1 == str && cc->name_2 == strp) goto bad_town_name;
 		}
 
+		SetDParam(0, strp);
 		name = GetString(str);
 		if (Utf8StringLength(name) >= MAX_LENGTH_COMPANY_NAME_CHARS) goto bad_town_name;