### Godot version

v4.1.dev.custom_build.a7276f1ce

### System information

Win10, AMD 2600, GeForce GTX 1060, Vulkan API 1.3.205

### Issue description

I can't get correct color data from an array of source_color type.
The color data is saved as **Color** in the file:
`shader_parameter/palette = [Color (1, 0, 0, 1), Color (0, 1, 0, 1), Color (0, 0, 1, 1)]`
Shouldn't it be saved as PackedColorArray?


### Steps to reproduce

1.Declare an array of source_color type.
2.Set colors.

### Minimal reproduction project

[shadertest.zip](https://github.com/godotengine/godot/files/11246504/shadertest.zip)

bool temp_error = false;
				uint32_t datatype_flag;
				if (!is_uniform) {
					datatype_flag = CF_VARYING_TYPE;
					keyword_completion_context = CF_INTERPOLATION_QUALIFIER | CF_PRECISION_MODIFIER | datatype_flag;
					if (_lookup_next(next)) {
						if (is_token_interpolation(next.type)) {
							keyword_completion_context ^= (CF_INTERPOLATION_QUALIFIER | datatype_flag);
						} else if (is_token_precision(next.type)) {
							keyword_completion_context ^= (CF_PRECISION_MODIFIER | datatype_flag);
						} else if (is_token_datatype(next.type)) {
							keyword_completion_context ^= datatype_flag;
						}
					}
				} else {
					datatype_flag = CF_UNIFORM_TYPE;
					keyword_completion_context = CF_PRECISION_MODIFIER | datatype_flag;
					if (_lookup_next(next)) {
						if (is_token_precision(next.type)) {
							keyword_completion_context ^= (CF_PRECISION_MODIFIER | datatype_flag);
						} else if (is_token_datatype(next.type)) {
							keyword_completion_context ^= datatype_flag;
						}
					}
				}
#endif 
				if (is_token_interpolation(tk.type)) {
					if (is_uniform) {
						_set_error(RTR("Interpolation qualifiers are not supported for uniforms."));
#ifdef DEBUG_ENABLED