Don't syntax highlight table names in the middle of other identifiers

Assuming you have a table names 't', the syntax highlighter would have
highlighted all ts in column names and other identifiers which aren't
highlighted otherwise. This is fixed by this commit.

src/SQLiteSyntaxHighlighter.cpp

@@ -101,7 +101,7 @@ void SQLiteSyntaxHighlighter::setTableNames(const QStringList &tablenames)
     tableNameRules.clear();
     foreach(const QString& tblname, tablenames) {
         HighlightingRule rule;
-        rule.pattern = QRegExp(tblname);
+        rule.pattern = QRegExp(QString("\\b%1\\b").arg(tblname));
         rule.format = tableFormat;
         tableNameRules.append(rule);
     }