Replaced pixmap entry with icon entries in spec file

It seems the pixmap was replaced by png and svg icons some time ago.
rpmbuild fails on the pixmap entry, so it needed to be updated.

Installer/dolphin-emu.spec

@@ -138,7 +138,8 @@ make %{?_smp_mflags} install DESTDIR="%{?buildroot}"
 %doc license.txt Readme.md
 %{_bindir}/%{name}
 %{_datadir}/%{name}
-%{_datadir}/pixmaps/dolphin-emu.xpm
+%{_datadir}/icons/hicolor/48x48/apps/%{name}.*
+%{_datadir}/icons/hicolor/scalable/apps/%{name}.*
 %{_datadir}/applications/%{name}.desktop
 %{_mandir}/man6/%{name}.*