Revert "sb crank: also consider fallback oracles"

This reverts commit a3a9d44.

ts/client/scripts/sb-on-demand-crank.ts

@@ -310,7 +310,10 @@ async function preparePullIx(
     gateway: oracle.gatewayUrl,
   };
   // TODO use fetchUpdateMany
-  const [pullIx] = await pullFeed.fetchUpdateIx(conf, recentSlothashes);
+  const [pullIx] = await pullFeed.fetchUpdateIx(
+    conf,
+    recentSlothashes,
+  );
 
   return pullIx;
 }
@@ -566,22 +569,6 @@ function getOraclesForMangoGroup(
       };
     });
 
-  const oraclesFb = Array.from(group.banksMapByName.values())
-    .filter(
-      (b) =>
-        !(
-          b[0].nativeDeposits().eq(ZERO_I80F48()) &&
-          b[0].nativeBorrows().eq(ZERO_I80F48()) &&
-          b[0].reduceOnly == 1
-        ),
-    )
-    .map((b) => {
-      return {
-        oraclePk: b[0].fallbackOracle,
-        name: b[0].name,
-      };
-    });
-
   // oracles for perp markets
   const oracles2 = Array.from(group.perpMarketsMapByName.values()).map((pM) => {
     return {
@@ -609,7 +596,7 @@ function getOraclesForMangoGroup(
       };
     })
     .filter((item) => !item.oraclePk.equals(PublicKey.default));
-  const oracles = oracles1.concat(oraclesFb).concat(oracles2).concat(oracles3);
+  const oracles = oracles1.concat(oracles2).concat(oracles3);
   return oracles;
 }