Org: Tweak header arg snippets

- Re-prioritise lower-case "s": silent is more common than session
- The $0 doesn't actually seem to change the final cursor position, and
  if the snippet is cancelled it is left behind as clutter.
- Fix incorrect labelling with NoWeb snippet

snippets/org-mode/header-arg-eval

@@ -3,4 +3,4 @@
 # key: v
 # condition: (+yas/org-src-header-p)
 # --
-`(let ((out (+yas/org-prompt-header-arg :eval "Evaluate: " '("no" "query" "no-export" "query-export")))) (if out (concat ":eval " out " ") ""))`$0
+`(let ((out (+yas/org-prompt-header-arg :eval "Evaluate: " '("no" "query" "no-export" "query-export")))) (if out (concat ":eval " out " ") ""))`

snippets/org-mode/header-arg-export

@@ -3,4 +3,4 @@
 # key: e
 # condition: (+yas/org-src-header-p)
 # --
-`(let ((out (+yas/org-prompt-header-arg :exports "Exports: " '("code" "results" "both" "none")))) (if out (concat ":exports " out " ") ""))`$0
+`(let ((out (+yas/org-prompt-header-arg :exports "Exports: " '("code" "results" "both" "none")))) (if out (concat ":exports " out " ") ""))`

snippets/org-mode/header-arg-noweb

@@ -3,4 +3,4 @@
 # key: n
 # condition: (+yas/org-src-header-p)
 # --
-`(let ((out (+yas/org-prompt-header-arg :noweb "Evaluate: " '("no" "yes" "tangle" "no-export" "strip-export" "eval")))) (if out (concat ":noweb " out " ") ""))`$0
+`(let ((out (+yas/org-prompt-header-arg :noweb "NoWeb: " '("no" "yes" "tangle" "no-export" "strip-export" "eval")))) (if out (concat ":noweb " out " ") ""))`

snippets/org-mode/header-arg-results

@@ -12,4 +12,4 @@
   (+yas/org-prompt-header-arg :results "Result output: " '("silent " "replace " "append " "prepend "))))))
   (if (string= out "") ""
   (concat ":results " out " ")))
-`$0
+`

snippets/org-mode/header-arg-session

@@ -1,6 +1,6 @@
 # -*- mode: snippet -*-
 # name: Header arg - session
-# key: s
+# key: S
 # condition: (+yas/org-src-header-p)
 # --
 :session "${1:`(file-name-base (or (buffer-file-name) "unnnamed"))`-session}" $0

snippets/org-mode/header-arg-silent

@@ -1,6 +1,6 @@
 # -*- mode: snippet -*-
 # name: Header arg - silent
-# key: S
+# key: s
 # condition: (+yas/org-src-header-p)
 # --
 :results silent $0

snippets/org-mode/header-arg-wrap

@@ -3,4 +3,4 @@
 # key: w
 # condition: (+yas/org-src-header-p)
 # --
-`(let ((out (+yas/org-prompt-header-arg :noweb "Wrap: " '("example" "export" "comment" "src")))) (if out (concat ":wrap " out " ") ""))`$0
+`(let ((out (+yas/org-prompt-header-arg :noweb "Wrap: " '("example" "export" "comment" "src")))) (if out (concat ":wrap " out " ") ""))`