tidy: drop redundant string initialization

alib2aux/src/convert/GasTexConverter.h

@@ -865,11 +865,11 @@ std::string GasTexConverter::getStackSymbols(const ext::vector<SymbolType>& stac
 		return "$\\varepsilon$";
 	}
-	std::string symbols = "";
+	std::string symbols;
 	int i=0;
 	for (const SymbolType & symbol : stackSymbols) {
 		if(i++ !=0) {
-			symbols +=" ";
+			symbols += " ";
 		}
 		symbols += replace ( factory::StringDataFactory::toString ( symbol ), "\"", "\\\"" );
 	}