Remove template types from lock RAII wrapper usages (#1756)

C++17 has template type autodeduction. These wrappers include
std::lock_guard and std::unique_lock.

cscore/src/main/native/cpp/SinkImpl.h

@@ -48,7 +48,7 @@ class SinkImpl : public PropertyContainer {
   void SetSource(std::shared_ptr<SourceImpl> source);
 
   std::shared_ptr<SourceImpl> GetSource() const {
-    std::lock_guard<wpi::mutex> lock(m_mutex);
+    std::lock_guard lock(m_mutex);
     return m_source;
   }