fix(helm): assign modified cvs back to i.Entries

Via assigning back the slice to original array,
the exclusion on invalid helm charts can be guaranteed.

Closes #12744

Signed-off-by: Geoffrey Chen <ziqianggeoffreychen@gmail.com>

pkg/repo/index.go

@@ -367,6 +367,7 @@ func loadIndex(data []byte, source string) (*IndexFile, error) {
 				cvs = append(cvs[:idx], cvs[idx+1:]...)
 			}
 		}
+		i.Entries[name] = cvs
 	}
 	i.SortEntries()
 	if i.APIVersion == "" {