Codechange: Use unique_ptr for fios company properties.

This is the data used to show company names in the saveload window.

src/fios.h

@@ -25,7 +25,7 @@ enum SaveLoadInvalidateWindowData {
 	SLIWD_FILTER_CHANGES,        ///< The filename filter has changed (via the editbox)
 };
 
-using CompanyPropertiesMap = std::map<uint, CompanyProperties *>;
+using CompanyPropertiesMap = std::map<uint, std::unique_ptr<CompanyProperties>>;
 
 /**
  * Container for loading in mode SL_LOAD_CHECK.

src/fios_gui.cpp

@@ -55,9 +55,6 @@ void LoadCheckData::Clear()
 	this->current_date = 0;
 	this->settings = {};
 
-	for (auto &pair : this->companies) {
-		delete pair.second;
-	}
 	companies.clear();
 
 	this->gamelog.Reset();

src/saveload/company_sl.cpp

@@ -527,8 +527,8 @@ struct PLYRChunkHandler : ChunkHandler {
 
 		int index;
 		while ((index = SlIterateArray()) != -1) {
-			CompanyProperties *cprops = new CompanyProperties();
-			SlObject(cprops, slt);
+			std::unique_ptr<CompanyProperties> cprops = std::make_unique<CompanyProperties>();
+			SlObject(cprops.get(), slt);
 
 			/* We do not load old custom names */
 			if (IsSavegameVersionBefore(SLV_84)) {
@@ -549,9 +549,7 @@ struct PLYRChunkHandler : ChunkHandler {
 			}
 
 			if (_load_check_data.companies.count(index) == 0) {
-				_load_check_data.companies[index] = cprops;
-			} else {
-				delete cprops;
+				_load_check_data.companies[index] = std::move(cprops);
 			}
 		}
 	}