gnu: KDE: Use breeze-icons over oxygen-icons.

* gnu/packages/kde-internet.scm (choqok kget konversation krdc krdc)
* gnu/packages/kde-multimedia.scm (dragon elisa juk k3b kaffeine kamoso
kmix kmplayer kwave)
* gnu/packages/kde-pim.scm (kaddressbook kcalutils kgpg kleopatra kmail
knotes korganizer)
* gnu/packages/kde-systemtools.scm (dolphin dolphin-plugins khelpcenter
konsole krfb ksystemlog)
* gnu/packages/kde-utils.scm (kate kmag kmousetool kmouth kronometer
krusader okteta rsibreak smb4k sweeper)
* gnu/packages/kde.scm (kdevelop)
Breeze icons replaces Oxygen icons in KDE 5, so use that in every package.

Signed-off-by: Marius Bakke <marius@gnu.org>

gnu/packages/kde-systemtools.scm

@@ -74,7 +74,7 @@
            ktextwidgets
            kuserfeedback
            kwindowsystem
-           oxygen-icons ;; default icon set
+           breeze-icons ;; default icon set
            phonon
            qtbase-5
            solid))
@@ -117,7 +117,7 @@ The main features of Dolphin are:
            ktexteditor
            ksyntaxhighlighting
            kxmlgui
-           oxygen-icons ;; default icon set
+           breeze-icons ;; default icon set
            qtbase-5))
     (home-page "http://www.kde.org/")
     (synopsis "VCS-Plugins for Dolphin")
@@ -156,7 +156,7 @@ Dolphin with the version control systems: Bzr, Git, Mercurial, Subversion.")
            kservice
            kwindowsystem
            libxml2
-           oxygen-icons ;; default icon set
+           breeze-icons ;; default icon set
            qtbase-5
            xapian))
     (arguments
@@ -222,7 +222,7 @@ document meta data file.")
            kwidgetsaddons
            kwindowsystem
            kxmlgui
-           oxygen-icons ;; default icon set
+           breeze-icons ;; default icon set
            qtbase-5
            qtscript))
     (arguments
@@ -269,7 +269,7 @@ This package is part of the KDE base applications module.")
            libvnc
            libxcb
            libxtst
-           oxygen-icons ;; default icon set
+           breeze-icons ;; default icon set
            pipewire-0.3
            plasma-wayland-protocols
            qtbase-5
@@ -319,7 +319,7 @@ This package is part of the KDE networking module.")
            ktextwidgets
            kwidgetsaddons
            kxmlgui
-           oxygen-icons ;; default icon set
+           breeze-icons ;; default icon set
            qtbase-5))
     (home-page "https://apps.kde.org/ksystemlog/")
     (synopsis "System log viewer")