Use delta suffix value from constants.py

pisi/atomicoperations.py

@@ -524,7 +524,7 @@ class Install(AtomicOperation):
         # installed packages
         self.installdb.add_package(self.pkginfo)
 
-        otype = "delta" if self.package_fname.endswith("delta.pisi") else None
+        otype = "delta" if self.package_fname.endswith(ctx.const.delta_package_suffix) else None
         self.historydb.add_and_update(pkgBefore=self.old_pkginfo, pkgAfter=self.pkginfo, operation=opttostr[self.operation], otype=otype)
 
 def install_single(pkg, upgrade = False):

pisi/db/filesdb.py

@@ -70,7 +70,7 @@ class FilesDB(lazydb.LazyDB):
         files_db = os.path.join(ctx.config.info_dir(), ctx.const.files_db)
         if os.path.exists(files_db):
             os.unlink(files_db)
-    
+
     def close(self):
         if isinstance(self.filesdb, shelve.DbfilenameShelf):
             self.filesdb.close()