Fix transaction name for non-sampled transactions

[felixbarny]

fixes #581

[codecov-io]

Codecov Report

Merging #597 into master will increase coverage by 0.14%.
The diff coverage is 22.22%.

@@             Coverage Diff              @@
##             master     #597      +/-   ##
============================================
+ Coverage     62.25%   62.39%   +0.14%     
  Complexity       68       68              
============================================
  Files           188      188              
  Lines          7092     7060      -32     
  Branches        818      814       -4     
============================================
- Hits           4415     4405      -10     
+ Misses         2408     2387      -21     
+ Partials        269      268       -1

Impacted Files	Coverage Δ	Complexity Δ
...va/co/elastic/apm/agent/impl/transaction/Span.java	66.66% <ø> (+2.89%)	0 <0> (ø)	⬇️
...lastic/apm/agent/impl/transaction/Transaction.java	88.23% <ø> (+16.8%)	0 <0> (ø)	⬇️
...astic/apm/agent/impl/transaction/AbstractSpan.java	81.25% <22.22%> (-9.98%)	0 <0> (ø)
...gent/servlet/wildfly/WildFlyLifecycleListener.java	85.71% <0%> (-14.29%)	0% <0%> (ø)
.../apm/agent/concurrent/ExecutorInstrumentation.java	45.45% <0%> (+4.71%)	0% <0%> (ø)	⬇️

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