Fix infinite loop on session creation (signalfx#72)

Author: mhennoch

example/__tests__/e2e/specs/http.e2e.ts

@@ -42,5 +42,6 @@ describe('Http request', () => {
     expect(fetchSpan.tags['http.url']).toBe(
       'https://raw.githubusercontent.com/signalfx/splunk-otel-react-native/main/package.json'
     );
+    expect(fetchSpan.tags['splunk.rumSessionId']).toBeDefined();
   });
 });

example/__tests__/e2e/specs/navigation.e2e.ts

@@ -49,5 +49,6 @@ describe('Navigation', () => {
     expect(createSpan.tags['screen.name']).toBe('Details');
     expect(createSpan.tags['app']).toBe('RnExample');
     expect(createSpan.tags['device.model.name']).toBeDefined();
+    expect(createSpan.tags['splunk.rumSessionId']).toBeDefined();
   });
 });

src/session.ts

@@ -60,9 +60,11 @@ AppState.addEventListener('change', (nextAppState) => {
 
 export function getSessionId() {
   if (hasExpired() || hasTimedOut()) {
+    bump();
     newSessionId();
+  } else {
+    bump();
   }
-  bump();
   return session.id;
 }