Werk #12529: Remove duplicated upload button on "Custom GUI design" page

Component	User interface
Title	Remove duplicated upload button on "Custom GUI design" page
Date	Mar 12, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Ultimate MT 2.0.0p1 Checkmk Ultimate MT

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