changes to snippets

nvim/ultisnips/tex.snippets

@@ -546,7 +546,7 @@ snippet pmat "Paren Matrix" iA
 endsnippet
 
 context "math()"
-snippet bmat "Bracket Matrix" iA
+snippet matr "Bracket Matrix" iA
 \begin{bmatrix} $1 \end{bmatrix} $0
 endsnippet
 
@@ -744,7 +744,7 @@ snippet nn "Tikz node" w
 $0
 endsnippet
 
-snippet problem "Problem" iA
+snippet problem "Problem" biA
 \pbl{$1}
     $0
 endsnippet
@@ -801,7 +801,7 @@ snippet impc "Import Code" wA
 \begin{listing}[${1:H}]
     \caption{$2}
     \label{lst:$3}
-    \importcode{$1}{$2}$0
+    \importcode{$4}{$5}$0
 \end{listing}
 endsnippet