MagnumFont: don't forget to close on destruction.

src/Plugins/MagnumFont/MagnumFont.cpp

@@ -61,6 +61,8 @@ MagnumFont::MagnumFont(): _opened(nullptr) {}
 
 MagnumFont::MagnumFont(PluginManager::AbstractManager* const manager, std::string plugin): AbstractFont(manager, std::move(plugin)), _opened(nullptr) {}
 
+MagnumFont::~MagnumFont() { close(); }
+
 auto MagnumFont::doFeatures() const -> Features { return Feature::OpenData|Feature::MultiFile|Feature::PreparedGlyphCache; }
 
 bool MagnumFont::doIsOpened() const { return _opened; }

src/Plugins/MagnumFont/MagnumFont.h

@@ -99,6 +99,8 @@ class MagnumFont: public AbstractFont {
         /** @brief Plugin manager constructor */
         explicit MagnumFont(PluginManager::AbstractManager* manager, std::string plugin);
 
+        ~MagnumFont();
+
     private:
         class Data;