Backport of #3981: Plaintext mode of mailcloak

[Harmageddon]

Hi folks!

PR #3981 fixed the plaintext functionality of the emailcloak plugin for 3.x. This PR fixes the same thing for 2.5.x.

Testing instructions

• Edit the plugin "Content - Email Cloaking".
  • Enabled: Yes
  • Mode: Non-linkable text

Use cases of this plugin (every of them with javascript enabled and disabled):

1. <a href="mailto:email@example.org">email@example.org</a>
2. <a href="mailto:email@example.org">text</a>
3. <a href="mailto:email@example.org"><img src="..." /></a>
4. <a href="mailto:email@example.org?subject=Text">email@example.org</a>
5. <a href="mailto:email@example.org?subject=Text">text</a>
6. <a href="mailto:email@example.org?subject=Text"><img src="..." /></a>
7. plain email@example.org

[infograf768]

Makes sense.

[zero-24]

@infograf768 have you test it?

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