chore(control): prevent closing popups by clicking outside (#20)

Multiple test users closed various popups accidentally by clicking outside and rarely used the feature to close the popup.

control/frontend/src/routes/FileView.svelte

@@ -67,7 +67,6 @@
 		open: false,
 		snippet: null,
 		title: '',
-		closable: true
 	});
 
 	let file_input: HTMLInputElement;
@@ -121,7 +120,6 @@
 			title: `${is_folder ? 'Ordner' : 'Datei'} umbenennen`,
 			title_icon: FolderPlus,
 			snippet_arg: extension,
-			closable: true
 		};
 	};
 
@@ -136,7 +134,6 @@
 			snippet: new_folder_popup,
 			title: 'Neuen Ordner erstellen',
 			title_icon: FolderPlus,
-			closable: true
 		};
 	};
 
@@ -146,7 +143,6 @@
 			snippet: delete_request_popup,
 			title: `${$selected_file_ids.length} ${$selected_file_ids.length === 1 ? 'Objekt' : 'Objekte'} wirklich löschen?`,
 			title_icon: Trash2,
-			closable: true
 		};
 	};