PY-29902 Use keyboard Esc in the admin permissions dialog to cancel installation

python/src/com/jetbrains/python/inspections/PyPackageRequirementsInspection.java

@@ -347,6 +347,7 @@ public class PyPackageRequirementsInspection extends PyInspection {
           new PyInterpreterInspection.ConfigureInterpreterFix().applyFix(project, descriptor);
           return true;
         case Messages.CANCEL:
+        case -1:
           return true;
       }
     }