rsz: clang-format RepairSetup.cc

Wrap long sta::Slack initialization line that clang-format flagged on
PR #10248 after the gemini-code-assist suggestion was applied via the
GitHub UI.

Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>

Author: oharboe

src/rsz/src/RepairSetup.cc

@@ -1041,7 +1041,8 @@ bool RepairSetup::terminateProgress(const int iteration,
       // Window is full; compare oldest sample (the one we are about to
       // overwrite on the next call) to the best (largest, i.e. least
       // negative) slack observed in the window.
-      sta::Slack window_best = *std::max_element(wns_history_.begin(), wns_history_.end());
+      sta::Slack window_best
+          = *std::max_element(wns_history_.begin(), wns_history_.end());
       const sta::Slack window_oldest = wns_history_[wns_history_head_];
       const float threshold
           = std::max(wns_stagnation_abs_tol_,