Rename EncoderBench.cpp to EncodeBench.cpp

Dropping the "r" makes it consistent with both the class name and
Benchmark::getName.

Bug: skia:
Change-Id: I17bcf699d162c678daabf92b4e39b7230428b98b
Reviewed-on: https://skia-review.googlesource.com/c/163280
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
2 files changed