profile: use @id: #this — LOSOS convention

LOSOS's schema-pane hardcodes 'var root = store.get("#this")' (line 78
of panes/schema-pane.js). Setting @id to anything else makes root null,
which throws TypeError at line 293 when reading root[key].name and blanks
the page. All other LOSOS demos (vcard on losos.org, todos here) use
@id: #this — the convention.

The Profile pane already hides the @id badge when @id is #this, so the
page still looks right. To view a real Solid profile, open with
?uri=https://my.pod/profile#me — shell's findSubject() resolves the
fragment and the WebID becomes the active subject.

Worth a LOSOS issue separately: schema-pane should use subject.value
instead of hardcoding #this. Out of scope here.

Author: melvincarvalho

profile/index.html

@@ -18,7 +18,7 @@
 <script type="application/ld+json">
 {
   "@context": { "@vocab": "urn:solid:" },
-  "@id": "https://www.w3.org/People/Berners-Lee/card#i",
+  "@id": "#this",
   "@type": "Person",
   "name": "Sir Tim Berners-Lee",
   "nick": "timbl",