Delete duplicate entry "MariaDB" from mode/meta.js

It's already listed above as "MariaDB SQL".

Also add the ".mps" extension to the MUMPS mode.

mode/meta.js

@@ -84,7 +84,7 @@
     {name: "MariaDB SQL", mime: "text/x-mariadb", mode: "sql"},
     {name: "Mathematica", mime: "text/x-mathematica", mode: "mathematica", ext: ["m", "nb"]},
     {name: "Modelica", mime: "text/x-modelica", mode: "modelica", ext: ["mo"]},
-    {name: "MUMPS", mime: "text/x-mumps", mode: "mumps"},
+    {name: "MUMPS", mime: "text/x-mumps", mode: "mumps", ext: ["mps"]},
     {name: "MS SQL", mime: "text/x-mssql", mode: "sql"},
     {name: "MySQL", mime: "text/x-mysql", mode: "sql"},
     {name: "Nginx", mime: "text/x-nginx-conf", mode: "nginx", file: /nginx.*\.conf$/i},
@@ -127,7 +127,6 @@
     {name: "SQL", mime: "text/x-sql", mode: "sql", ext: ["sql"]},
     {name: "Squirrel", mime: "text/x-squirrel", mode: "clike", ext: ["nut"]},
     {name: "Swift", mime: "text/x-swift", mode: "swift", ext: ["swift"]},
-    {name: "MariaDB", mime: "text/x-mariadb", mode: "sql"},
     {name: "sTeX", mime: "text/x-stex", mode: "stex"},
     {name: "LaTeX", mime: "text/x-latex", mode: "stex", ext: ["text", "ltx"], alias: ["tex"]},
     {name: "SystemVerilog", mime: "text/x-systemverilog", mode: "verilog", ext: ["v"]},