Remove PCA colormap bug for float output maps (#2620)

Previously, "PCA" would be offered as a colormap option for float outputs (and throws "PCA is not a known colormap" error).

nerfstudio/viewer_beta/control_panel.py

@@ -445,7 +445,7 @@ def _get_colormap_options(dimensions: int, dtype: type) -> List[Colormaps]:
     if dimensions == 3:
         colormap_options = ["default"]
     if dimensions == 1 and dtype in [torch.float64, torch.float32, torch.float16, torch.bfloat16]:
-        colormap_options = [c for c in list(get_args(Colormaps)) if c != "default"]
+        colormap_options = [c for c in list(get_args(Colormaps)) if c not in ("default", "pca")]
     if dimensions > 3:
         colormap_options = ["pca"]
     return colormap_options