No queries header presented for cases "Create" - "Query" headers available

#### Purpose

In cases when we have just "Create" and "Query" members "Query" member isn't shown.

#### Modifications

Making `DisplayModeToTextDecorationsConverter` as `MultiConverter` too handle situations when we have only header (`Query` or `Actions`).

#### Additional references

[MAGN-5394](http://adsk-oss.myjetbrains.com/youtrack/issue/MAGN-5394).

#### Reviewers

@aosyatnik, @Benglin, please, take a look.