Fix line number in broken test.

We have this code:
20: ddd :: Num a => a -> a -> a
21: ddd vv ww = vv +! ww

The intention was to ask for the type definition of symbol "a" in line 20, and
then assert that no type definitions were found.

The reality is that the test was asking for the definition of the symbol at (20,
15) in 0-based indexing, which is the "!" in "+!". Until recently, ghcide could
not find type definitions for "+!", so no type definitions were
found and the test passed. But now, ghcide can find type definitions for "+!",
and this test has begun to fail.

The solution is to change (20, 15) to (19, 15), so that we ask for the type
definitions of the symbol "a", which will not be found.

Author: peterwicksstringfield

ghcide/test/exe/Main.hs

@@ -2444,7 +2444,7 @@ findDefinitionAndHoverTests = let
   xtcL5  = Position  9 11  ;  xtc    = [ExpectExternFail,   ExpectHoverText ["Int", "Defined in ", "GHC.Types"]]
   tcL6   = Position 10 11  ;  tcData = [mkR   7  0    9 16, ExpectHoverText ["TypeConstructor", "GotoHover.hs:8:1"]]
   vvL16  = Position 20 12  ;  vv     = [mkR  20  4   20  6]
-  opL16  = Position 20 15  ;  op     = [mkR  21  2   21  4]
+  opL16  = Position 19 15  ;  op     = [mkR  21  2   21  4]
   opL18  = Position 22 22  ;  opp    = [mkR  22 13   22 17]
   aL18   = Position 22 20  ;  apmp   = [mkR  22 10   22 11]
   b'L19  = Position 23 13  ;  bp     = [mkR  23  6   23  7]