fix(metrics): Prevent NaNs in sampling from occuring

A code path could lead to a NaN if diff_running is 0 as this would
result in  a division-by-zero.

This commit solves this problem by just deleting that code path, as
there is no evidence that the bug it addresses has existed in recent
times, if ever.

include/lo2s/perf/counter/counter_buffer.hpp

@@ -73,13 +73,6 @@ class CounterBuffer
             {
                 accumulated_[i] += diff_value;
             }
-            // Due to a perf bug diff_enabled and diff_running may be swapped
-            // diff_enabled is always smaller than diff_running so swap them if diff_enabled >
-            // diff_running
-            else if (diff_enabled > diff_running)
-            {
-                accumulated_[i] += (static_cast<double>(diff_enabled) / diff_running) * diff_value;
-            }
             else
             {
                 accumulated_[i] += (static_cast<double>(diff_running) / diff_enabled) * diff_value;