SystemMonitor: Show thread name instead of process name

Add the thread name to CThreadStatistics and display it in the
system monitor's process model instead of the process name.

Applications/SystemMonitor/ProcessModel.cpp

@@ -295,11 +295,12 @@ void ProcessModel::update()
             state.ipv4_socket_write_bytes = thread.ipv4_socket_write_bytes;
             state.file_read_bytes = thread.file_read_bytes;
             state.file_write_bytes = thread.file_write_bytes;
-            state.name = it.value.name;
             state.amount_virtual = it.value.amount_virtual;
             state.amount_resident = it.value.amount_resident;
             state.icon_id = it.value.icon_id;
 
+            state.name = thread.name;
+
             state.tid = thread.tid;
             state.times_scheduled = thread.times_scheduled;
             state.priority = thread.priority;

Libraries/LibCore/CProcessStatisticsReader.cpp

@@ -46,6 +46,7 @@ HashMap<pid_t, CProcessStatistics> CProcessStatisticsReader::get_all()
             CThreadStatistics thread;
             thread.tid = thread_object.get("tid").to_u32();
             thread.times_scheduled = thread_object.get("times_scheduled").to_u32();
+            thread.name = thread_object.get("name").to_string();
             thread.state = thread_object.get("state").to_string();
             thread.ticks = thread_object.get("ticks").to_u32();
             thread.priority = thread_object.get("priority").to_string();

Libraries/LibCore/CProcessStatisticsReader.h

@@ -20,6 +20,7 @@ struct CThreadStatistics {
     unsigned file_write_bytes;
     String state;
     String priority;
+    String name;
 };
 
 struct CProcessStatistics {