Remove expander blocks in issue template

.github/ISSUE_TEMPLATE.md

@@ -1,30 +1,25 @@
 My `composer.json`:
-<details>
-<summary>CLICK TO EXPAND</summary>
+
 ```json
 ...replace me...
 ```
-</details>
 
 Output of `composer diagnose`:
-<details>
-<summary>CLICK TO EXPAND</summary>
+
 ```
 ...replace me...
 ```
-</details>
 
 When I run this command:
+
 ```
 ...replace me...
 ```
 
 I get the following output:
-<details>
-<summary>CLICK TO EXPAND</summary>
+
 ```
 ...replace me...
 ```
-</details>
 
 And I expected this to happen: