Bug fix: Move updating the current branch to the checkoutRef method.

Stops the branch from being updated back to the current branch when the Refresh Automatically preference is on.

PBGitRepository.m

@@ -269,7 +269,6 @@ static NSString * repositoryBasePath = nil;
 	// Add an "All branches" option in the branches list
 	[self addBranch:[PBGitRevSpecifier allBranchesRevSpec]];
 	[self addBranch:[PBGitRevSpecifier localBranchesRevSpec]];
-    [self readCurrentBranch];
 
 	[[[self windowController] window] setTitle:[self displayName]];
 

PBRefController.m

@@ -67,6 +67,7 @@
 		return;
 	}
 	[historyController.repository reloadRefs];
+	[historyController.repository readCurrentBranch];
 	[commitController rearrangeObjects];
 }