Make whitespace more consistent in libkqueue tests.

After r337820, which "corrected" some spaces-instead-of-tab whitespace
issues in the libkqueue tests, jmg@ pointed out that these files were
originally space-based, not tab-spaced, and so the correction should
have been to get rid of the tabs that had been introduced in previous
changes, not the spaces. This change does that. This is a whitespace
only change; no functional change is intended.

Reported by:	jmg@
MFC after:	3 days
Sponsored by:	Dell EMC Isilon

tests/sys/kqueue/libkqueue/timer.c

@@ -34,7 +34,6 @@ int kqfd;
 static long
 now(void)
 {
-  
     struct timeval tv;
 
     gettimeofday(&tv, NULL);
@@ -47,7 +46,6 @@ now(void)
 void
 mssleep(int t)
 {
-
     struct timespec stime = {
         .tv_sec = 0,
         .tv_nsec = US_TO_NS(MS_TO_US(t)),
@@ -62,7 +60,6 @@ mssleep(int t)
 void
 ussleep(int t)
 {
-
     struct timespec stime = {
         .tv_sec = 0,
         .tv_nsec = US_TO_NS(t),