renderer: add expand_undersized_textures

adds an option to disable the texture expansion for textures that are smaller while resizing up

src/config/ConfigManager.cpp

@@ -590,6 +590,7 @@ CConfigManager::CConfigManager() {
     m_pConfig->addConfigValue("render:explicit_sync", Hyprlang::INT{2});
     m_pConfig->addConfigValue("render:explicit_sync_kms", Hyprlang::INT{2});
     m_pConfig->addConfigValue("render:direct_scanout", Hyprlang::INT{0});
+    m_pConfig->addConfigValue("render:expand_undersized_textures", Hyprlang::INT{1});
 
     // devices
     m_pConfig->addSpecialCategory("device", {"name"});