reformat source code

according to code styles, 'AccessModifierOffset' should be -2.

unittest/share/test_latch.cpp

@@ -23,7 +23,7 @@
 namespace oceanbase {
 namespace common {
 class TestLatchStress : public share::ObThreadPool {
-  public:
+public:
   TestLatchStress();
   virtual ~TestLatchStress();
   virtual void run1();