GDScript: Fix error message for unfound type

modules/gdscript/gdscript_analyzer.cpp

@@ -731,7 +731,7 @@ GDScriptParser::DataType GDScriptAnalyzer::resolve_datatype(GDScriptParser::Type
 		}
 	}
 	if (!result.is_set()) {
-		push_error(vformat(R"("%s" was not found in the current scope.)", first), p_type);
+		push_error(vformat(R"(Could not find type "%s" in the current scope.)", first), p_type);
 		return bad_type;
 	}
 

modules/gdscript/tests/scripts/analyzer/errors/not_found_type.gd

@@ -0,0 +1,3 @@
+func test():
+	var foo: Foo
+	print('not ok')

modules/gdscript/tests/scripts/analyzer/errors/not_found_type.out

@@ -0,0 +1,2 @@
+GDTEST_ANALYZER_ERROR
+Could not find type "Foo" in the current scope.