Correct preprocessor directive syntax

The previous incorrect syntax cause compilation of the library to fail:

SparkFun_CCS811_Arduino_Library\src\SparkFunCCS811.cpp:61:8: error: macro names must be identifiers

 #ifdef (ARDUINO_ARCH_ESP32 ARDUINO_ARCH_ESP8266)

        ^

Note that compilation for ESP32 still fails with a different error:

SparkFun_CCS811_Arduino_Library\src\SparkFunCCS811.cpp:62:7: error: 'class TwoWire' has no member named 'setClockStretchLimit'

  Wire.setClockStretchLimit(200000);// was defautl 230 uS, now 200ms

       ^

From espressif/arduino-esp32#81, it's not clear whether there are plans to ever add the setClockStretchLimit function for ESP32.

Author: per1234

src/SparkFunCCS811.cpp

@@ -58,7 +58,7 @@ CCS811Core::status CCS811Core::beginCore(void)
 #else
 #endif
 
-#ifdef (ARDUINO_ARCH_ESP32 ARDUINO_ARCH_ESP8266)
+#if defined(ARDUINO_ARCH_ESP32) || defined(ARDUINO_ARCH_ESP8266)
 	Wire.setClockStretchLimit(200000);// was defautl 230 uS, now 200ms
 #else
 #endif