test: fix warning for comment in embedtest

[pluris]

• Build log(Ubuntu 20.04)

...
../test/embedding/embedtest.cc:67:3: warning: multi-line comment [-Wcomment]
   67 |   // embedtest js_code_to_eval arg1 arg2... \
      |   ^
../test/embedding/embedtest.cc:72:3: warning: multi-line comment [-Wcomment]
   72 |   // embedtest --embedder-snapshot-blob blob-path \
...

Warning messages are occurring due to a comments on the following line.

node/test/embedding/embedtest.cc

Lines 65 to 76 in 3a6a80a

	// Format of the arguments of this binary:
	// Building snapshot:
	// embedtest js_code_to_eval arg1 arg2... \
	// --embedder-snapshot-blob blob-path \
	// --embedder-snapshot-create
	// [--embedder-snapshot-as-file]
	// Running snapshot:
	// embedtest --embedder-snapshot-blob blob-path \
	// [--embedder-snapshot-as-file]
	// arg1 arg2...
	// No snapshot:
	// embedtest arg1 arg2...

A line of comment starting with // is supposed to end at the newline character.
However, if a backslash(\) is placed at the end of the line, the comment is extended to the next line. This is because the backslash at the end of a line is a line-continuation character, which tells the compiler to treat the next line as a continuation of the current line. This can lead to unexpected behavior, hence the compiler warning.

There are several suggestions for solving this, but I suggest a simple way to remove the backslash(\).

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/53671/

[nodejs-github-bot]

Landed in ea32c3c