Fix logsource not a string

rules/windows/builtin/win_susp_logon_explicit_credentials.yml

@@ -13,7 +13,6 @@ tags:
 logsource:
     product: windows
     service: security
-    definition: 
 detection:
     selection:
         EventID: 4648

rules/windows/other/win_lateral_movement_condrv.yml

@@ -15,7 +15,6 @@ tags:
 logsource:
     product: windows
     service: security
-    definition: 
 detection:
     selection:
           EventID: 4674

tests/test_rules.py

@@ -613,6 +613,9 @@ class TestRules(unittest.TestCase):
                 if key.lower() not in valid_logsource:
                     print(Fore.RED + "Rule {} has a logsource with an invalid field ({})".format(file, key))
                     valid = False
+                elif not isinstance(logsource[key],str):
+                    print(Fore.RED + "Rule {} has a logsource with an invalid field type ({})".format(file, key))
+                    valid = False
             if not valid:
                faulty_rules.append(file)