manifest: Remove duplicate

Already in remove.xml.

fatal: remove-project element specifies non-existent project:
platform/packages/apps/Stk

Change-Id: Iec36eb51fb44fff8f13bd070694e41a8c4038006

remove-minimal.xml

@@ -275,7 +275,6 @@
     <remove-project name="platform/packages/apps/SafetyRegulatoryInfo" />
     <remove-project name="platform/packages/apps/SoundRecorder" />
     <remove-project name="platform/packages/apps/SpareParts" />
-    <remove-project name="platform/packages/apps/Stk" />
     <remove-project name="platform/packages/apps/StorageManager" />
     <remove-project name="platform/packages/apps/Tag" />
     <remove-project name="platform/packages/apps/Terminal" />