Clang: Cleanup string interface of sqlite

We only will need the utf8 optimized SmallString for the indexer database.
So we remove all other string bindings, QByteArray and QVariant.

Change-Id: I4a77901a80b26bf292fc85df535c2ccf3a8ab52f
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/libs/sqlite/sqlitewritestatement.cpp

@@ -27,9 +27,9 @@
 
 namespace Sqlite {
 
-SqliteWriteStatement::SqliteWriteStatement(const Utf8String &sqlStatementUtf8,
+SqliteWriteStatement::SqliteWriteStatement(Utils::SmallStringView sqlStatement,
                                            SqliteDatabase &database)
-    : SqliteStatement(sqlStatementUtf8, database)
+    : SqliteStatement(sqlStatement, database)
 {
     checkIsWritableStatement();
 }