clang-tidy: fixes invalid case style in LinuxContainerCpuStatsReader (envoyproxy#38580)

contributes to envoyproxy#28566

Signed-off-by: Takeshi Yoneda <t.y.mathetake@gmail.com>

Author: mathetake

source/extensions/resource_monitors/cpu_utilization/linux_cpu_stats_reader.h

@@ -27,7 +27,7 @@ class LinuxCpuStatsReader : public CpuStatsReader {
 class LinuxContainerCpuStatsReader : public CpuStatsReader {
 public:
   LinuxContainerCpuStatsReader(
-      TimeSource& time_source_,
+      TimeSource& time_source,
       const std::string& linux_cgroup_cpu_allocated_file = LINUX_CGROUP_CPU_ALLOCATED_FILE,
       const std::string& linux_cgroup_cpu_times_file = LINUX_CGROUP_CPU_TIMES_FILE);
   CpuTimes getCpuTimes() override;