[Glitch] Code style improvements in JavaScript

Port fd76955f39 to glitch-soc

* JS-linter: fix trailing comma's

* Configure eslinter to ignore this onchange error.

Signed-off-by: Thibaut Girka <thib@sitedethib.com>

app/javascript/flavours/glitch/features/blocks/index.js

@@ -66,7 +66,7 @@ class Blocks extends ImmutablePureComponent {
           bindToDocument={!multiColumn}
         >
           {accountIds.map(id =>
-            <AccountContainer key={id} id={id} />
+            <AccountContainer key={id} id={id} />,
           )}
         </ScrollableList>
       </Column>