Fix Bug 427916 - User Feedback string about "Account configured in KMail" is misleading

BUG: 427916
FIXED-IN: 5.16.0
2 jobs for master in 58 minutes and 12 seconds (queued for 2 minutes and 44 seconds)
Status Job ID Name Coverage
  Build
passed #73320
build_clazy_clang_tidy

00:24:24

passed #73319
linux kf5-qt5 qt5.12

00:33:48

11.0%