Update the character used in powerline

The code points have been updated in 53fbfe1, see
- https://github.com/Lokaltog/powerline/commit/53fbfe15fead8cc7598bcb4ee9714a221ab7e446
- https://github.com/Lokaltog/powerline/issues/4

themes/agnoster.zsh-theme

@@ -26,7 +26,7 @@
 # A few utility functions to make it easy and re-usable to draw segmented prompts
 
 CURRENT_BG='NONE'
-SEGMENT_SEPARATOR='⮀'
+SEGMENT_SEPARATOR=''
 
 # Begin a segment
 # Takes two arguments, background and foreground. Both can be omitted,
@@ -90,7 +90,7 @@ prompt_git() {
     zstyle ':vcs_info:*' formats ' %u%c'
     zstyle ':vcs_info:*' actionformats '%u%c'
     vcs_info
-    echo -n "${ref/refs\/heads\//⭠ }${vcs_info_msg_0_}"
+    echo -n "${ref/refs\/heads\// }${vcs_info_msg_0_}"
   fi
 }
 
@@ -110,7 +110,7 @@ prompt_hg() {
 				# if working copy is clean
 				prompt_segment green black
 			fi
-			echo -n $(hg prompt "⭠ {rev}@{branch}") $st
+			echo -n $(hg prompt " {rev}@{branch}") $st
 		else
 			st=""
 			rev=$(hg id -n 2>/dev/null | sed 's/[^-0-9]//g')
@@ -124,7 +124,7 @@ prompt_hg() {
 			else
 				prompt_segment green black
 			fi
-			echo -n "⭠ $rev@$branch" $st
+			echo -n " $rev@$branch" $st
 		fi
 	fi
 }