Backport early exit from Web (#3595)

Author: schmidt-sebastian

firebase-firestore/src/main/java/com/google/firebase/firestore/core/Target.java

@@ -287,6 +287,7 @@ private Pair<Value, Boolean> getAscendingBound(
             segmentValue = cursorValue;
             segmentInclusive = bound.isInclusive();
           }
+          break;
         }
       }
     }
@@ -351,6 +352,7 @@ private Pair<Value, Boolean> getDescendingBound(
             segmentValue = cursorValue;
             segmentInclusive = bound.isInclusive();
           }
+          break;
         }
       }
     }