Remove hash symbol in front of opcode error messages in GDScript

The hash symbol creates spurious issue references on GitHub if
the message is posted outside a code block, which means some issues
have a lot more references than originally intended.

(cherry picked from commit 63d214f04bec14a62a823b6ca45cb325dc4407a1)

modules/gdscript/gdscript_function.cpp

@@ -1537,7 +1537,7 @@ Variant GDScriptFunction::call(GDScriptInstance *p_instance, const Variant **p_a
 		}
 		int err_line = line;
 		if (err_text == "") {
-			err_text = "Internal Script Error! - opcode #" + itos(last_opcode) + " (report please).";
+			err_text = "Internal script error! Opcode: " + itos(last_opcode) + " (please report).";
 		}
 
 		if (!GDScriptLanguage::get_singleton()->debug_break(err_text, false)) {