Fix regression from storing monotonic time deltas

When starting htop the timestamp of the first scan
must be far in the past to avoid showing all processes as
being started just recently.

Fixes: b616857

Machine.c

@@ -101,11 +101,12 @@ void Machine_scanTables(Machine* this) {
 
    if (firstScanDone) {
       this->prevMonotonicMs = this->monotonicMs;
+      Platform_gettime_monotonic(&this->monotonicMs);
    } else {
       this->prevMonotonicMs = 0;
+      this->monotonicMs = 1;
       firstScanDone = true;
    }
-   Platform_gettime_monotonic(&this->monotonicMs);
    assert(this->monotonicMs > this->prevMonotonicMs);
 
    this->maxUserId = 0;