Open Theme Options(from appearance menu item in dashboard) and go to "Custom JS/CSS" tab, then paste into Custom CSS field next lines:

#wph-header .navbar-brand {
  padding-top: 0;
  padding-bottom: 0;
}

Then save. This will increase a logo area for 25px in height. If you need additional 25px add these lines instead:

#wph-header .navbar-brand {
  padding-top: 0;
  padding-bottom: 0;
  margin-top: -12.5px;
  margin-bottom: -12.5px;
  height: 75px;
}
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