batchprotect/batchdelete: fix bug in batchprotect

PrefixIndex URLs use `prefix` parameter, not a `from` parameter.
Also, mw.util.getParamValue takes care of converting `+` to space, (though queryString also does that since f0866be; before that commit this was a bug)
Also, use of Morebits.toUpperCaseFirstChar is unnecessary, that is taken care of by the API.

modules/twinklebatchdelete.js

@@ -131,7 +131,7 @@ Twinkle.batchdelete.callback = function twinklebatchdeleteCallback() {
 		query.gaplimit = Twinkle.getPref('batchMax'); // the max for sysops
 		if (mw.util.getParamValue('prefix')) {
 			query.gapnamespace = mw.util.getParamValue('namespace');
-			query.gapprefix = Morebits.string.toUpperCaseFirstChar(mw.util.getParamValue('prefix'));
+			query.gapprefix = mw.util.getParamValue('prefix');
 		} else {
 			var pathSplit = decodeURIComponent(location.pathname).split('/');
 			if (pathSplit.length < 3 || pathSplit[2] !== 'Special:PrefixIndex') {

modules/twinklebatchprotect.js

@@ -282,7 +282,7 @@ Twinkle.batchprotect.callback = function twinklebatchprotectCallback() {
 	} else if (mw.config.get('wgCanonicalSpecialPageName') === 'Prefixindex') {
 		query.generator = 'allpages';
 		query.gapnamespace = mw.util.getParamValue('namespace') || $('select[name=namespace]').val();
-		query.gapprefix = Morebits.string.toUpperCaseFirstChar(mw.util.getParamValue('from') ? mw.util.getParamValue('from').replace('+', ' ') : $('input[name=prefix]').val());
+		query.gapprefix = mw.util.getParamValue('prefix') || $('input[name=prefix]').val();
 		query.gaplimit = Twinkle.getPref('batchMax'); // the max for sysops
 	} else {
 		query.generator = 'links';