Fix backend api ENV var

[vaasuu]

It was loading the wrong env var.

[coveralls]

Pull Request Test Coverage Report for Build 7160405378

Warning: This coverage report may be inaccurate.

We've detected an issue with your CI configuration that might affect the accuracy of this pull request's coverage report. To ensure accuracy in future PRs, please see these guidelines. A quick fix for this PR: rebase it; your next report should be accurate.

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 1110 unchanged lines in 35 files lost coverage.
• Overall coverage decreased (-2.7%) to 70.562%

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Files with Coverage Reduction	New Missed Lines	%
frontend/coverage/frontend/src/components/chat/MessageBubble.jsx	1	94.29%
frontend/coverage/frontend/src/pages/about-us/AboutUs.jsx	1	95.59%
frontend/coverage/frontend/src/utils/parseTokenExpiration.js	1	70.0%
frontend/coverage/frontend/src/components/activity-list/ActivityListItem.jsx	2	94.74%
frontend/coverage/frontend/src/components/compact-activity-list/CompactActivityList.jsx	2	96.15%
frontend/coverage/frontend/src/components/compact-article-list/CompactArticleList.jsx	2	96.08%
frontend/coverage/frontend/src/components/calendar-sidebar/CalendarSidebar.jsx	3	94.74%
frontend/coverage/frontend/src/components/friend-list-item/FriendListItem.jsx	3	89.74%
frontend/coverage/frontend/src/pages/frontpage/Frontpage.jsx	4	92.75%
frontend/coverage/frontend/src/pages/news-article/NewsArticlePage.jsx	4	88.68%
<!--	Total:	1110		-->

Totals
Change from base Build 7160311378:	-2.7%
Covered Lines:	3034
Relevant Lines:	4294

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💛 - Coveralls