LibCore+Utilities: Replace ElapsedTimer precise flag with an enum

Previously, `true` was passed into the ElapsedTimer constructor if a
precise timer was required. We now use an enum to more explicitly
specify whether we would like a precise or a coarse timer.

Userland/Utilities/abench.cpp

@@ -39,7 +39,7 @@ ErrorOr<int> serenity_main(Main::Arguments args)
     }
     auto loader = maybe_loader.release_value();
 
-    Core::ElapsedTimer sample_timer { true };
+    Core::ElapsedTimer sample_timer { Core::TimerType::Precise };
     i64 total_loader_time = 0;
     int remaining_samples = sample_count > 0 ? sample_count : NumericLimits<int>::max();
     unsigned total_loaded_samples = 0;

Userland/Utilities/dd.cpp

@@ -45,7 +45,7 @@ struct {
     size_t total_bytes_copied = 0;
     size_t total_blocks_in = 0, partial_blocks_in = 0;
     size_t total_blocks_out = 0, partial_blocks_out = 0;
-    Core::ElapsedTimer timer { true };
+    Core::ElapsedTimer timer { Core::TimerType::Precise };
 } statistics;
 
 static void closing_statistics()

Userland/Utilities/traceroute.cpp

@@ -78,7 +78,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     // 0: got ttl exhausted response
     // -1: error or no response
     auto try_reach_host = [&](int ttl) -> ErrorOr<int> {
-        Core::ElapsedTimer m_timer { true };
+        Core::ElapsedTimer m_timer { Core::TimerType::Precise };
         auto ttl_number = ByteString::number(ttl);
         for (auto i = 0; i < max_retries; i++) {
             icmp_request request {};