Fix a couple of typos in PerfettoUtils

This change adds a space after the 'TEMP_DIR' variable, and updates the
parameter list comment on setWritable from 'readable' to 'writable'.

Test: none
Bug: 227805529
Change-Id: I23ce3c1ea7b12c2d94da4d9294b0f938b0904737
1 file changed