Fixing issue with union padding serialization

[DrewDAGator]

In the CommonAPI::SomeIP::OutputStream class, there is a bug in the writeValue(...) overload for serializing a Variant.

Essentially, in the case where it has to pad the serialized union because it has to have a fixed length, i.e. unionLengthWidth == 0, the call to _writeValue(const uint32_t &_value, const uint8_t &_width) for adding the padding is incorrect because it passes in the number of bits to be serialized (8) for width when it should be passing in the number of bytes to be serialized (1), which is what the function is expecting. This causes the function to not add any padding because 8 is an invalid input for the width parameter. This PR changes the 8 to 1. An alternative would be to use one of the uint8_t overloads of _writeValue(...) instead of the uint32_t overload.