Fix for when there are 0 accessibility services

mvt/android/artifacts/dumpsys_accessibility.py

@@ -56,7 +56,7 @@ def parse(self, content: str) -> None:
 
         for line in content.splitlines():
             if line.strip().startswith("Enabled services:"):
-                matches = re.finditer(r"{([^{]*?)}", line)
+                matches = re.finditer(r"{([^{]+?)}", line)
 
                 for match in matches:
                     # Each match is in format: <package_name>/<service>