RuntimeContext: make _finishTime not static

Author: HashidaTKS

RepostConfirmationCanceler/Logger.cs

@@ -37,7 +37,7 @@ internal Logger(RunTimeMode mode)
                 FilePath = Path.Combine(logDirectory, $"{LogFileNameBase}.log");
                 EnableLogging = true;
             }
-            catch (Exception ex)
+            catch (Exception)
             {
                 // ログ出力できないが、全体の処理は続行する。
             }

RepostConfirmationCanceler/RuntimeContext.cs

@@ -34,7 +34,7 @@ internal DateTime FinishTime
                 }
             }
         }
-        private static DateTime _finishTime = DateTime.MinValue;
+        private DateTime _finishTime = DateTime.MinValue;
 
         internal bool IsEndTime
         {