Fix typo

Change-Id: I715da280563c7c3f03eb9b521478db4481ae4b2f
Reviewed-on: https://gerrit.libreoffice.org/72322
Tested-by: Jenkins
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>

basic/source/comp/dim.cxx

@@ -684,7 +684,7 @@ void SbiParser::Enum()
 
 void SbiParser::DefEnum( bool bPrivate )
 {
-    // Read a the new Token. It had to be a symbol
+    // Read the new Token. It had to be a symbol
     if (!TestSymbol())
         return;