VH-1279: Fix sonar reported bugs in MessageRouterBasic.cpp (#588)

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# PR Details
## Description
Resolve sonar reported bugs in MessageRouterBasic.cpp
(https://sonarcloud.io/project/issues?resolved=false&types=BUG&id=usdot-fhwa-ops_V2X-Hub).
Removed unnecessary use of `volatile` keyword (see ThreadsafeCounter
from https://en.cppreference.com/w/cpp/language/cv).
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## Related Issue
VH-1297
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## Motivation and Context
Technical Debt
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## How Has This Been Tested?

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## Types of changes

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- [x] Defect fix (non-breaking change that fixes an issue)
- [ ] New feature (non-breaking change that adds functionality)
- [ ] Breaking change (fix or feature that cause existing functionality
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## Checklist:

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- [ ] I have added any new packages to the sonar-scanner.properties file
- [ ] My change requires a change to the documentation.
- [ ] I have updated the documentation accordingly.
- [x] I have read the **CONTRIBUTING** document.
[V2XHUB Contributing
Guide](https://github.com/usdot-fhwa-OPS/V2X-Hub/blob/develop/Contributing.md)
- [ ] I have added tests to cover my changes.
- [ ] All new and existing tests passed.

src/tmx/TmxCore/src/MessageRouterBasic.cpp

@@ -50,11 +50,9 @@ void MessageRouterBasic::broadcastMessage(MessageReceiver *sender, IvpMessage *m
 
 	//PerformanceTimer timer;
 
-	pthread_mutex_lock(&this->mMapLock);
 	pthread_mutex_lock(&this->mActiveBroadcastsLock);
 	this->mActiveBroadcasts++;
 	pthread_mutex_unlock(&this->mActiveBroadcastsLock);
-	pthread_mutex_unlock(&this->mMapLock);
 
 	int broadcastCount = 0;
 
@@ -107,7 +105,7 @@ void MessageRouterBasic::broadcastMessage(MessageReceiver *sender, IvpMessage *m
 			}
 		}
 	}
-
+	
 	pthread_mutex_lock(&this->mActiveBroadcastsLock);
 	this->mActiveBroadcasts--;
 	pthread_mutex_unlock(&this->mActiveBroadcastsLock);

src/tmx/TmxCore/src/MessageRouterBasic.h

@@ -52,7 +52,7 @@ class MessageRouterBasic : public MessageRouter
 	 * Keeps track of how many threads are actively inside the broadcast method in a thread safe manner (using mActiveBroadcastsLock).
 	 * This is to allow concurrent execution of the broadcast, but give the register and unregister methods a way to tell when broadcasts are inactive.
 	 */
-	volatile int mActiveBroadcasts;
+	int mActiveBroadcasts;
 
 	/*!
 	 * Used to keep the mActiveBroadcast count accurate since multiple thread's may be accessing.