Input Diagnosis page "Received Message count by Stream" stream link names shouldn't include ":"

## Expected Behavior

The Input name link shown in the `Received Message count by Stream` section of the `Input Diagnosis` page should not include a `:` suffix as part of the `StyledTitleLink` value, as it suggests `:` is part of the Stream name.

## Current Behavior

The Input name link shown in the `Received Message count by Stream` section of the `Input Diagnosis` page includes `:` at the end of the `StyledTitleLink` value, suggesting `:` is part of the Stream name.

https://github.com/Graylog2/graylog2-server/blob/adc626831f3170716845df46ae9237b7e93e1d7d/graylog2-web-interface/src/components/inputs/InputDiagnosis/InputDiagnosisOverviewTab.tsx#L466

## Possible Solution

Remove the `:`.

## Steps to Reproduce (for bugs)

1. Be on `7.1.2`
2. Have a related Input and Stream, with messages coming in
3. View the Input's `Input Diagnosis` page
4. Note the Stream name link in the `Received Message count by Stream` has a `:` suffix

## Context

Just unexpected to see an entity link where the name isn't accurately reflected.

## Your Environment

* Graylog Version: `7.1.2`