Accept tiff input data in scale_image tool

[kostrykin]

The scale_image tool was only accepting PNG files:

galaxy-image-analysis/tools/scale_image/scale_image.xml

Line 40 in 5bf3d88

<param name="input" type="data" format="png" label="Image file"/>

Strangely, there already were tests for TIFF files and they passed despite the format="png" attribute:

galaxy-image-analysis/tools/scale_image/scale_image.xml

Line 80 in 5bf3d88

<param name="input" value="input2_normalized.tiff"/>

Is this a bug in the testing framework?

This PR fixes the format attribute so that TIFF files are also accepted (tests are already there).

cc @dianichj

---

FOR THE CONTRIBUTOR — Please fill out if applicable

Please make sure you have read the CONTRIBUTING.md document (last updated: 2024/04/23).

• License permits unrestricted use (educational + commercial).

If this PR adds or updates a tool or tool collection:

• This PR adds a new tool or tool collection.
• This PR updates an existing tool or tool collection.
• Tools added/updated by this PR comply with the Naming and Annotation Conventions for Tools in the Image Community in Galaxy (or explain why they do not).