Sitemap parser: Fix negative numbers not allowed for visibility (#1928)

The sitemap DSL parser was not able to correctly recognize negative numbers.

Regression from https://github.com/openhab/openhab-webui/pull/1843 where explicit
recognition of hyphens was introduced for new icon syntax.

Signed-off-by: Mark Herwege <mark.herwege@telenet.be>

bundles/org.openhab.ui/web/src/assets/sitemap-lexer.nearley

@@ -20,7 +20,6 @@
     lwidget:          ['Text ', 'Group ', 'Image ', 'Frame '],
     lparen:           '(',
     rparen:           ')',
-    colon:            ':',
     lbrace:           '{',
     rbrace:           '}',
     lbracket:         '[',
@@ -32,13 +31,13 @@
     lt:               '<',
     gt:               '>',
     equals:           '=',
-    comma:            ',',
-    colon:            ':',
-    hyphen:           '-',
     NL:               { match: /\n/, lineBreaks: true },
     boolean:          /(?:true)|(?:false)/,
     identifier:       /(?:[A-Za-z_][A-Za-z0-9_]*)|(?:[0-9]+[A-Za-z_][A-Za-z0-9_]*)/,
-    number:           /\-?[0-9]+(?:\.[0-9]*)?/,
+    number:           /-?[0-9]+(?:\.[0-9]*)?/,
+    comma:            ',',
+    colon:            ':',
+    hyphen:           '-',
     string:           { match: /"(?:\\["\\]|[^\n"\\])*"/, value: x => x.slice(1, -1) }
   })
   const requiresItem = ['Group', 'Chart', 'Switch', 'Mapview', 'Slider', 'Selection', 'Setpoint', 'Input ', 'Colorpicker', 'Default']