Check proto argument in arguments for service

Commit f5ea44cc adds pid information for non-proto dump.
But the common usage of tests pass the proto argument
for the target service instead of dumpsys, e.g.
 dumpsys activity --proto activities
In this case, asProto is still false that leads to the
pid information in text format is contained in proto dump.

Fix: 141371622
Test: atest DumpsysTest
Test: atest DisplaySizeTest
Change-Id: I6b3fb180985b33e7c97849556f8ba47b4776ca86