[explorer] Remove extra spaces around 's'

Summary:
on a transaciton page, in the block row under general details, the 's' in confirmations has a space either side
This came from the line break from the new formatting

Test Plan: preview the site and check the space is no longer there

Reviewers: #bitcoin_abc, PiRK, tobias_ruck

Reviewed By: #bitcoin_abc, PiRK, tobias_ruck

Subscribers: tobias_ruck, PiRK

Differential Revision: https://reviews.bitcoinabc.org/D16683