In the Simple XML Reference for the input type dropdown, there's a showClearButton child element listed. For example:
<input type="dropdown" token="sourcetype_tok">
<showClearButton>false</showClearButton>
<label>Select a source type</label>
<default>splunkd</default>
<choice value="splunkd">splunkd</choice>
<choice value="splunk_web_access">splunk_web_access</choice>
<choice value="splunkd_ui_access">splunkd_ui_access</choice>
</input>
I know this was an old question, but I was seeking the same answer, so maybe this will save someone else some time. 🙂
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