Fix 65cbde4b: Writing to uninitialized string when loading a currency NewGRF.

src/newgrf.cpp

@@ -2679,8 +2679,8 @@ static ChangeInfoResult GlobalVarChangeInfo(uint gvid, int numinfo, int prop, By
 				uint16 options = buf->ReadWord();
 
 				if (curidx < CURRENCY_END) {
-					_currency_specs[curidx].separator[0] = GB(options, 0, 8);
-					_currency_specs[curidx].separator[1] = '\0';
+					_currency_specs[curidx].separator.clear();
+					_currency_specs[curidx].separator.push_back(GB(options, 0, 8));
 					/* By specifying only one bit, we prevent errors,
 					 * since newgrf specs said that only 0 and 1 can be set for symbol_pos */
 					_currency_specs[curidx].symbol_pos = GB(options, 8, 1);