Update taxi_trips demo query

[sgrebnov]

Fixes https://github.com/spicehq/spiceai/issues/166

1. Fixes ordering (DESC)
2. Updates query from the most expensive taxi trips to the longest taxi trips as most distances for most expensive trips are zero (see below)

sql> SELECT trip_distance_mi, fare_amount FROM taxi_trips ORDER BY fare_amount DESC LIMIT 10;
+------------------+-------------+
| trip_distance_mi | fare_amount |
+------------------+-------------+
| 0.0              | 310.0       |
| 0.0              | 280.0       |
| 64.8             | 275.0       |
| 60.0             | 256.5       |
| 0.0              | 250.0       |
| 0.0              | 175.0       |
| 0.0              | 171.0       |
| 25.7             | 163.0       |
| 122.4            | 160.0       |
| 0.5              | 156.0       |
+------------------+-------------+ 

PR with similar change to Spice Readme:
spiceai/spiceai#948

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