Truncate the middle of pathnames in the Unstaged/Staged Changes lists.

Previously, the ends of the pathnames were truncated instead, which
could lose the filename.

Author: nriley

PBGitCommitView.xib

@@ -203,7 +203,7 @@
 																				</object>
 																				<object class="NSTextFieldCell" key="NSDataCell" id="45690317">
 																					<int key="NSCellFlags">337772096</int>
-																					<int key="NSCellFlags2">133120</int>
+																					<int key="NSCellFlags2">133632</int>
 																					<string key="NSContents">Text Cell</string>
 																					<reference key="NSSupport" ref="26"/>
 																					<reference key="NSControlView" ref="588180404"/>
@@ -605,7 +605,7 @@
 																				</object>
 																				<object class="NSTextFieldCell" key="NSDataCell" id="39450212">
 																					<int key="NSCellFlags">67239488</int>
-																					<int key="NSCellFlags2">133120</int>
+																					<int key="NSCellFlags2">133632</int>
 																					<string key="NSContents">Text Cell</string>
 																					<reference key="NSSupport" ref="26"/>
 																					<reference key="NSControlView" ref="638535043"/>