Fix style warnings to make CI pass

We accumulated a bunch of style warnings over time that make our CI fail:

[checkstyle] Running Checkstyle 6.17 on 82 files

BUILD FAILED
/builds/tpo/network-health/metrics/website/src/build/java/base.xml:222: Checkstyle complaints: Starting audit...
[WARN] /builds/tpo/network-health/metrics/website/src/main/java/org/torproject/metrics/stats/hidserv/Aggregator.java:45: Line is longer than 80 characters (found 81). [LineLength]
[WARN] /builds/tpo/network-health/metrics/website/src/main/java/org/torproject/metrics/stats/hidserv/Extrapolator.java:301: Block comment has incorrect indentation level 12, expected is 13, indentation should be the same level as line 314. [CommentsIndentation]
[WARN] /builds/tpo/network-health/metrics/website/src/main/java/org/torproject/metrics/stats/hidserv/Extrapolator.java:303: Line is longer than 80 characters (found 83). [LineLength]
[WARN] /builds/tpo/network-health/metrics/website/src/main/java/org/torproject/metrics/stats/hidserv/Extrapolator.java:314: 'if' child have incorrect indentation level 13, expected level should be 12. [Indentation]
[WARN] /builds/tpo/network-health/metrics/website/src/main/java/org/torproject/metrics/stats/hidserv/Parser.java:201: 'method def' child have incorrect indentation level 8, expected level should be 4. [Indentation]
[WARN] /builds/tpo/network-health/metrics/website/src/main/java/org/torproject/metrics/stats/hidserv/Parser.java:261:6: WhitespaceAround: '{' is not preceded with whitespace. [WhitespaceAround]
[WARN] /builds/tpo/network-health/metrics/website/src/main/java/org/torproject/metrics/stats/hidserv/Parser.java:266: Line is longer than 80 characters (found 85). [LineLength]
[WARN] /builds/tpo/network-health/metrics/website/src/main/java/org/torproject/metrics/stats/hidserv/Parser.java:269: Line is longer than 80 characters (found 82). [LineLength]

Let's fix them now.