fix: set supported_colormaps for colormapfactory (#466)

### Issue


#458 (comment)

### What?/ Why?

- `colorMaps` endpoint was returning the new colormaps but
`colorMaps/colorMapId` wasn't.

### Testing?

https://jtran.delta-backend.com/api/raster/docs#/ColorMaps/getColorMap

<img width="1682" alt="Screenshot 2025-03-10 at 2 59 35 PM"
src="https://github.com/user-attachments/assets/54f9faeb-5322-4431-9070-e436c56dc41b"
/>

Author: botanical

raster_api/runtime/src/app.py

@@ -205,9 +205,8 @@ async def lifespan(app: FastAPI):
 ###############################################################################
 # Colormaps endpoints
 ###############################################################################
-cmaps = ColorMapFactory()
 # Set supported colormaps to be the modified cmap list with added colormaps
-cmaps.supported_colormaps = cmap
+cmaps = ColorMapFactory(supported_colormaps=cmap)
 app.include_router(cmaps.router, tags=["ColorMaps"])