Update sqlite date expression

Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/MethodCallExpressionResolve.cs

@@ -882,6 +882,10 @@ namespace SqlSugar
             {
                 return $"to_char({value},'{formatString}') ";
             }
+            else if (IsSqlite() && formatString == "yyyy-MM-dd") 
+            {
+                return $"strftime('%Y-%m-%d', {value})";
+            }
             else if (IsMySql() && formatString == "yyyy-MM-dd")
             {
                 return $"DATE_FORMAT({value}, '%Y-%m-%d')";