browser: Update ui-assets.go

[krishnasrinivas]

Description

305952d did not have es6-object-assign module. Fixing it.

Motivation and Context

fix #3898 (comment)

How Has This Been Tested?

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[mention-bot]

@krishnasrinivas, thanks for your PR! By analyzing the history of the files in this pull request, we identified @harshavardhana to be a potential reviewer.

[codecov-io]

Codecov Report

Merging #3899 into master will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3899      +/-   ##
==========================================
+ Coverage    72.7%   72.72%   +0.02%     
==========================================
  Files         166      166              
  Lines       21341    21341              
==========================================
+ Hits        15515    15520       +5     
+ Misses       4804     4800       -4     
+ Partials     1022     1021       -1

Impacted Files	Coverage Δ
cmd/fs-v1-background-append.go	79.86% <0%> (ø)	✅
cmd/posix.go	73.4% <0%> (+0.15%)	✅
cmd/xl-v1-utils.go	92.11% <0%> (+0.82%)	✅
cmd/xl-v1-metadata.go	72.85% <0%> (+0.95%)	✅

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[krishnasrinivas]

@rushenn is sending another PR using https://babeljs.io/docs/usage/polyfill/
closing this PR