Fix logic error in setEmailAddress

[smrtab]

Fixes #739

Checklist

• I have made a material change to the repo (functionality, testing, spelling, grammar)
• I have read the [Contribution Guide] and my PR follows them.
• I updated my branch with the master branch.
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation about the functionality in the appropriate .md file
• I have added in line documentation to the code I modified

Short description of what this PR does:

The next condition on line 73 is wrong (file /mail/EmailAddress.php).
if (!is_string($emailAddress) && filter_var($emailAddress, FILTER_VALIDATE_EMAIL))

It turns out that email address shouldn't be a string and should be a valid address simultaneously in order to throw exception.

Probably the right condition is:
if (!(is_string($emailAddress) && filter_var($emailAddress, FILTER_VALIDATE_EMAIL)))
If you have questions, please send an email to Sendgrid, or file a Github Issue in this repository.

[SendGridDX]

All committers have signed the CLA.

[peter279k]

I also use the similar approach to fix this issue.

[thinkingserious]

Hello @smrtab,

Thanks again for the PR!

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[thinkingserious]

Hello @smrtab,

Thanks again for the PR!

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[thinkingserious]

Hello @smrtab,

Thanks again for the PR!

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