Steps to reproduce:
# Create a project
# Window->UI Toolkit->UI Builder
# Go to the "Controls" window and find "Button"
# Double-click on it
# Verify, that button becomes added 
# Select it
# Verify, that its data becomes displayed in the "Inspector" window
# Find the "Background" section in the "Inlined Styles" section
# Expand it
# Change the "Texture" option to the "Render Texture" option in the "Image" area
# Open the "Select RenderTexture" modal by clicking the background image selection field.
# Observe the modal title

Actual result: The title is "Select RenderTexture". Added screenshot in the "Attachments" section.

Expected result: The title should be  "Select Render Texture" as in all other sections we see two words. So modal title should be consistent with other places.

Reproducible with: 2021.3.30f1, 2022.3.10f1, 2023.1.11f1, 2023.2.0b10, 2023.3.0a5.