AGI: Fix predictive input binary search

Note that there are still issues with this input mode. If the binary
search hits a prefix match before finding the full match, it won't
recognize the full match. (Example: typing "buy" will show "buz"
because it's aiming for "buzzard" without realizing "buy" exists.)
(cherry picked from commit 41ba243)

engines/agi/predictive.cpp

@@ -566,7 +566,7 @@ bool AgiEngine::matchWord() {
 	int hi = _predictiveDictLineCount - 1;
 	int lo = 0;
 	int line = 0;
-	while (lo < hi) {
+	while (lo <= hi) {
 		line = (lo + hi) / 2;
 		int cmpVal = strncmp(_predictiveDictLine[line], _currentCode.c_str(), _currentCode.size());
 		if (cmpVal > 0)