phosphor-webui: srcrev bump 2e1eec80de..47a7eeeb9e

Ed Tanous (1):
      Drop encoding library

Gunnar Mills (1):
      README: Mention AngularJS EOL and webui-vue

(From meta-phosphor rev: 69436b736ab78df101ea32ff3aba0b13e74fd8b2)

Change-Id: Ib5f38c242648b1698992c5f09162d2f9d681a4c9
Signed-off-by: Andrew Geissler <openbmcbump-github@yahoo.com>
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>