kde-apps/kdecore-meta: Drop IUSE thumbnail

kde-apps/dolphin now pulling in kde-apps/thumbnailers in RDEPEND.

Signed-off-by: Andreas Sturmlechner <asturm@gentoo.org>

kde-apps/kdecore-meta/kdecore-meta-9999.ebuild

@@ -9,7 +9,7 @@ HOMEPAGE="https://apps.kde.org/"
 LICENSE="metapackage"
 SLOT="0"
 KEYWORDS=""
-IUSE="+share +thumbnail +webengine"
+IUSE="+share +webengine"
 
 RDEPEND="
 	>=kde-apps/dolphin-${PV}:*
@@ -29,8 +29,4 @@ RDEPEND="
 # Optional runtime deps: kde-apps/dolphin
 RDEPEND="${RDEPEND}
 	share? ( kde-frameworks/purpose:6 )
-	thumbnail? (
-		>=kde-apps/ffmpegthumbs-${PV}:*
-		>=kde-apps/thumbnailers-${PV}:*
-	)
 "