CommitView: Remove checking if same file is displayed

This causes trouble if a file was partially staged,
or if we switch from the staged changes to the
unstaged changes.

It should be quick enough not to matter anyway, so
let's simplify things and remove the check.

PBWebChangesController.h

@@ -15,8 +15,6 @@
 	IBOutlet NSArrayController *unstagedFilesController;
 	IBOutlet NSArrayController *cachedFilesController;
 	IBOutlet PBGitCommitController *controller;
-	
-	id previousFile;
 }
 
 - (void) showDiff:(PBChangedFile *)file cached:(BOOL)cached;

PBWebChangesController.m

@@ -58,12 +58,6 @@ static PBChangedFile *lastFileSelected = nil;
 		return;
 	}
 
-	// Don't reload if we already display this file
-	if (previousFile == file)
-		return;
-
-	previousFile = file;
-
 	id script = [view windowScriptObject];
 	NSLog(@"Showing diff..");
 	[script callWebScriptMethod:@"showFileChanges" withArguments:[NSArray arrayWithObjects:file, [NSNumber numberWithBool:cached], nil]];