tests: decrease the number of expected featured apps

tests/main/searching/task.yaml

@@ -11,8 +11,8 @@ execute: |
         snap find
         exit 1
     fi
-    if [ $(snap find | wc -l) -lt 3 ]; then
-        echo "Found less than 3 featured apps, this seems bogus:"
+    if [ $(snap find | wc -l) -lt 2 ]; then
+        echo "Not found any featured app, this seems bogus:"
         snap find
         exit 1
     fi