Do not hide expression when user presses Enter or = (#695)

* #653 Do not hide expression on EQU operation

* #653 Clear expression, when user makes an action

* #653 Fixed UI tests

* #653 Review fixes

src/CalcViewModel/HistoryItemViewModel.cpp

@@ -1,4 +1,4 @@
-// Copyright (c) Microsoft Corporation. All rights reserved.
+// Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
 
 #include "pch.h"
@@ -52,16 +52,6 @@ String
         }
     }
 
-    if (SUCCEEDED(hr))
-    {
-        wstring expressionSuffix{};
-        hr = spTokens->GetExpressionSuffix(&expressionSuffix);
-        if (SUCCEEDED(hr))
-        {
-            accExpression << expressionSuffix;
-        }
-    }
-
     if (FAILED(hr))
     {
         return LocalizationService::GetNarratorReadableString(fallbackExpression);