build-recipe-kiwi: make kiwi_profile local

without this, the kiwi_profile in the calling function will
be modified, resulting in skipped builds for multiple <type/>
definitions in one build, only the first one will be built

build-recipe-kiwi

@@ -457,7 +457,7 @@ perform_image_bundle() {
     local profile=$3
     local bundle_call
 
-    kiwi_profile=""
+    local kiwi_profile=""
     if [ "$profile" != "__not__set" ]; then
         kiwi_profile="${profile}-"
     fi