applet: Fix icon for action to log into captive portal

Ismael Asensiorequested to merge
work/iasensio/captive-portal-action into master

Let's give the action to log-in into a captive portal more visibility in the tray header, as it is the action the user most likely wants to take. Otherwise it's only found under the context menu

BEFORE AFTER
plasmanm-captiveportal-before plasmanm-captiveportal-after
Edited by Ismael Asensio

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