Add hta@ to rtc_base/ and api/ WATCHLISTS.

No-Try: True
Bug: None
Change-Id: I84491fef3ed031736e281a2d2e4154e7055dd142
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/200780
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32911}

WATCHLISTS

@@ -113,8 +113,9 @@
                      'peah@webrtc.org',
                      'saza@webrtc.org'],
     'audio': ['peah@webrtc.org'],
-    'api': ['peah@webrtc.org'],
-    'base': [],
+    'api': ['hta@webrtc.org',
+            'peah@webrtc.org'],
+    'base': ['hta@webrtc.org'],
     'call': ['mflodman@webrtc.org',
              'stefan@webrtc.org'],
     'video': ['mflodman@webrtc.org',