[bugfix] Fix remote media pruning failing if media already gone (#548)

* fix error check of prune to allow missing files

* update go-store library, add test for pruning item with db entry but no file

Signed-off-by: kim <grufwub@gmail.com>

* remove now-unneccessary error check

Signed-off-by: kim <grufwub@gmail.com>

Co-authored-by: kim <grufwub@gmail.com>

vendor/codeberg.org/gruf/go-runners/context.go

@@ -5,6 +5,13 @@ import (
 	"time"
 )
 
+// closedctx is an always closed context.
+var closedctx = func() context.Context {
+	ctx := make(cancelctx)
+	close(ctx)
+	return ctx
+}()
+
 // ContextWithCancel returns a new context.Context impl with cancel.
 func ContextWithCancel() (context.Context, context.CancelFunc) {
 	ctx := make(cancelctx)