gnu: marble-qt: Rename to marble.

* gnu/packages/kde-education.scm (marble-qt): Deprecate and rename to...
(marble): ...this.
* gnu/packages/kde-graphics.scm (digikam)[inputs]: Adapt.

Change-Id: Ib521c4a2d058b8b6b68c3e1359c73485877c25ea

gnu/packages/kde-education.scm

@@ -359,9 +359,9 @@ to perform data analysis.")
     (license (list license:gpl2+     ;labplot
                    license:gpl3+)))) ;liborigin
 
-(define-public marble-qt
+(define-public marble
   (package
-    (name "marble-qt")
+    (name "marble")
     (version "25.08.3")
     (source
      (origin
@@ -422,3 +422,6 @@ becomes a world atlas, while OpenStreetMap takes the user to street level.  It
 supports searching for places of interest, viewing Wikipedia articles,
 creating routes by drag and drop and more.")
     (license license:lgpl2.1+)))
+
+;; 2026-01-07
+(define-deprecated-package marble-qt marble)

gnu/packages/kde-graphics.scm

@@ -222,7 +222,7 @@ for scanner hardware.")
              libtiff
              libxml2
              libxslt
-             marble-qt
+             marble
              mesa
              opencv
              perl-image-exiftool