currently (2.1.3) you find there the following code, which conditionally puts out a start text:
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{if isset($starttext)}{$starttext}: {/if}
- the default start text if no parameter start_text is given
- a colon if it is given, but empty.
So you have no way to switch off the colon without editing the default template.
I suggest to alter the line to
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{if isset($starttext) && $starttext}{$starttext}: {/if}
cheers ...