Fix bug in BuildEqualityPredicate

When adding quotes to the predicate, redis throws/returns the following error:

```
"Invalid argument(s): Closing quote must be followed by a space or nothing at all."
```

This works:
`"FT.SEARCH" "idx" @name:"Test"`

But this does not:
`"FT.SEARCH" "idx" (@name:"Test")`

So I thought it would be safer to remove the quotes

src/Redis.OM/Common/ExpressionTranslator.cs

@@ -842,7 +842,7 @@ private static string BuildEqualityPredicate(MemberExpression member, string rig
                     sb.Append($"{{{ExpressionParserUtilities.EscapeTagField(right)}}}");
                     break;
                 case SearchFieldType.TEXT:
-                    sb.Append($"\"{right}\"");
+                    sb.Append($"{right}");
                     break;
                 case SearchFieldType.NUMERIC:
                     sb.Append($"[{right} {right}]");