Do not mark a server as "not installed" when updating it's startup arguments

app/Services/Servers/StartupModificationService.php

@@ -101,8 +101,7 @@ class StartupModificationService
             ]);
         }
 
-        $server->forceFill([
-            'installed' => 0,
+        $server->fill([
             'startup' => $data['startup'] ?? $server->startup,
             'skip_scripts' => $data['skip_scripts'] ?? isset($data['skip_scripts']),
             'image' => $data['docker_image'] ?? $server->image,

tests/Integration/Services/Servers/StartupModificationServiceTest.php

@@ -96,6 +96,9 @@ class StartupModificationServiceTest extends IntegrationTestCase
         $this->assertSame('sample startup', $response->startup);
         $this->assertSame('docker/hodor', $response->image);
         $this->assertTrue($response->skip_scripts);
+        // Make sure we don't revert back to a lurking bug that causes servers to get marked
+        // as not installed when you modify the startup...
+        $this->assertSame(1, $response->installed);
     }
 
     /**