### 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)

if (is_token_arg_qual(next.type)) {
								keyword_completion_context = CF_UNSPECIFIED;
							} else if (is_token_precision(next.type)) {
								keyword_completion_context = (CF_FUNC_DECL_PARAM_SPEC | CF_FUNC_DECL_PARAM_TYPE);
							} else if (is_token_datatype(next.type)) {
								keyword_completion_context = (CF_FUNC_DECL_PARAM_SPEC | CF_PRECISION_MODIFIER);
							}
						}
#endif 
					}
					ArgumentQualifier param_qualifier = ARGUMENT_QUALIFIER_IN;
					if (is_token_arg_qual(tk.type)) {
						bool error = false;
						switch (tk.type) {
							case TK_ARG_IN: {
								param_qualifier = ARGUMENT_QUALIFIER_IN;
							} break;
							case TK_ARG_OUT: {
								if (param_is_const) {
									_set_error(vformat(RTR("The '%s' qualifier cannot be used within a function parameter declared with '%s'."), "out", "const"));
									error = true;
								}
								param_qualifier = ARGUMENT_QUALIFIER_OUT;
							} break;
							case TK_ARG_INOUT: {
								if (param_is_const) {
									_set_error(vformat(RTR("The '%s' qualifier cannot be used within a function parameter declared with '%s'."), "inout", "const"));
									error = true;
								}
								param_qualifier = ARGUMENT_QUALIFIER_INOUT;