Fix xsns_87_mcp2515

[mbezuidenhout]

Description:

The init_status flag did not get set so no output was generated. The user selected pin was being ignored and always set to 5.

Checklist:

• [x] The pull request is done against the latest development branch
• [x] Only relevant files were touched
• [x] Only one feature/fix was added per PR and the code change compiles without warnings
• [x] The code change is tested and works with Tasmota core ESP8266 V.2.7.6
• [x] The code change is tested and works with Tasmota core ESP32 V.3.0.0
• [x] I accept the CLA.