Improving syntax for bash scripts

hack/lib/golang.sh

@@ -594,11 +594,11 @@ kube::golang::build_binaries_for_platform() {
 
   for binary in "${binaries[@]}"; do
     if [[ "${binary}" =~ ".test"$ ]]; then
-      tests+=($binary)
+      tests+=(${binary})
     elif kube::golang::is_statically_linked_library "${binary}"; then
-      statics+=($binary)
+      statics+=(${binary})
     else
-      nonstatics+=($binary)
+      nonstatics+=(${binary})
     fi
   done