Core: Fix MSVC2013 compilation

	shortcutsettings.h(84) : error C2536: 'Core::Internal::ShortcutButton::Core::Internal::ShortcutButton::m_key' : cannot specify explicit initializer for arrays

Change-Id: I8df6f788cd56c75b3fc71b8349a1c77139175460
Reviewed-by: Alessandro Portale <alessandro.portale@theqtcompany.com>

src/plugins/coreplugin/dialogs/shortcutsettings.cpp

@@ -115,6 +115,7 @@ namespace Internal {
 
 ShortcutButton::ShortcutButton(QWidget *parent)
     : QPushButton(parent)
+    , m_key({{ 0, 0, 0, 0 }})
 {
     setToolTip(tr("Click and type the new key sequence."));
     setCheckable(true);

src/plugins/coreplugin/dialogs/shortcutsettings.h

@@ -38,6 +38,8 @@
 #include <QPointer>
 #include <QPushButton>
 
+#include <array>
+
 QT_BEGIN_NAMESPACE
 class QGroupBox;
 class QKeyEvent;
@@ -81,7 +83,7 @@ private:
     QString m_checkedText;
     QString m_uncheckedText;
     mutable int m_preferredWidth = -1;
-    int m_key[4] = { 0, 0, 0, 0 };
+    std::array<int, 4> m_key;
     int m_keyNum = 0;
 };