feat(tex): remove deprecated bf/it commands

I'd left them in, but see that they're not included in the snipmate
definitions at all.

Author: sanjayankur31

UltiSnips/tex.snippets

@@ -248,22 +248,14 @@ snippet srto "... Root" wi
 endsnippet
 
 snippet bf "Bold" wi
-\bf{${1:${VISUAL}}}$0
-endsnippet
-
-snippet tbf "Bold" wi
 \textbf{${1:${VISUAL}}}$0
 endsnippet
 
-snippet it "Italic" wi
-\it{${1:${VISUAL}}}$0
-endsnippet
-
-snippet tit "Italic" wi
+snippet ita "Italic" wi
 \textit{${1:${VISUAL}}}$0
 endsnippet
 
-snippet ttt "Teletype" wi
+snippet tt "Teletype" wi
 \texttt{${1:${VISUAL}}}$0
 endsnippet