defaults: set nostartofline (#11135)

Having the cursor change column can be surprising.

Force startofline in functional and old tests.
Remove the functional breakindent test, as it's a subset of the oldtest one.

src/nvim/options.lua

@@ -2325,9 +2325,9 @@ return {
       full_name='startofline', abbreviation='sol',
       type='bool', scope={'global'},
       vi_def=true,
-      vim=true,
+      vim=false,
       varname='p_sol',
-      defaults={if_true={vi=true}}
+      defaults={if_true={vi=false}}
     },
     {
       full_name='statusline', abbreviation='stl',

src/nvim/testdir/setup.vim

@@ -19,6 +19,7 @@ set sidescroll=0
 set tags=./tags,tags
 set undodir^=.
 set wildoptions=
+set startofline
 
 " Prevent Nvim log from writing to stderr.
 let $NVIM_LOG_FILE = exists($NVIM_LOG_FILE) ? $NVIM_LOG_FILE : 'Xnvim.log'