Update test_csv_field.cpp

Author: vincentlaucsb

tests/test_csv_field.cpp

@@ -148,9 +148,9 @@ TEST_CASE("CSVField get<>() - Floating Point Value", "[test_csv_field_get_float]
         REQUIRE(euler.try_get(double_out));
         REQUIRE(double_out == Catch::Approx(2.718));
 
-        double long_double_out = 0;
+        long double long_double_out = 0;
         REQUIRE(euler.try_get(long_double_out));
-        REQUIRE(double_out == Catch::Approx(2.718l));
+        REQUIRE(long_double_out == Catch::Approx(2.718l));
 
         int int_out = 0;
         REQUIRE_FALSE(euler.try_get(int_out));