CommandDelete: refactor: split handle to several methods

cli/commanddelete.h

@@ -8,6 +8,9 @@ public:
     using Command::Command;
 
     int handle(QStringList arguments) override;
+private:
+    int removeNonExistent(QSqlDatabase &db, bool verbose, bool dryRun, QString pattern);
+    int removePaths(const QStringList &paths, QSqlDatabase &db, bool verbose, bool dryRun);
 };
 
 #endif // COMMANDDELETE_H