fix: fixed title of terrainrgb algorithm (#804)

Author: JinIgarashi

src/titiler/core/titiler/core/algorithm/dem.py

@@ -132,7 +132,7 @@ def __call__(self, img: ImageData) -> ImageData:
 class TerrainRGB(BaseAlgorithm):
     """Encode DEM into RGB (Mapbox Terrain RGB)."""
 
-    title: str = "Terrarium"
+    title: str = "TerrainRGB"
     description: str = "Encode DEM into RGB (Mapbox Terrain RGB)."
 
     # parameters