src: remove extra semicolons outside fns
Fixes the following:
../../third_party/electron_node/src/node_blob.cc:500:65: error: extra ';' outside of a function is incompatible with C++98 [-Werror,-Wc++98-compat-extra-semi]
NODE_MODULE_CONTEXT_AWARE_INTERNAL(blob, node::Blob::Initialize);
^
../../third_party/electron_node/src/node_blob.cc:501:77: error: extra ';' outside of a function is incompatible with C++98 [-Werror,-Wc++98-compat-extra-semi]
NODE_MODULE_EXTERNAL_REFERENCE(blob, node::Blob::RegisterExternalReferences);
^
2 errors generated.