Reset status text when install starts

src/main.cpp

@@ -363,6 +363,8 @@ void App::BusySet(bool value)
         cancel = false;
         phase = 0;
         applied = 0;
+        workText = L"Подготовка…";
+        HideProgress();
         DimControls(true);
         goText = L"ОТМЕНИТЬ";
         goBg = ColorFromHex(0xC0392B);