fix(ui): remove dead code

This function isn't used by react-style, it doesn't match any valid function names, there's singleValue but we don't want break-word on that, it default to truncating too long text

ui/src/Components/MultiSelect/index.js

@@ -41,11 +41,6 @@ const ReactSelectStyles = {
           borderRadius: "0.25rem",
           backgroundColor: "#fff"
         },
-  valueLabel: (base, state) => ({
-    ...base,
-    whiteSpace: "normal",
-    wordWrap: "break-word"
-  }),
   multiValue: (base, state) => ({
     ...base,
     borderRadius: "4px",

ui/src/Components/SilenceModal/__snapshots__/AlertManagerInput.test.js.snap

@@ -148,7 +148,6 @@ exports[`<AlertManagerInput /> matches snapshot 1`] = `
       "multiValueRemove": [Function],
       "option": [Function],
       "valueContainer": [Function],
-      "valueLabel": [Function],
     }
   }
 />

ui/src/Components/SilenceModal/__snapshots__/LabelNameInput.test.js.snap

@@ -34,7 +34,6 @@ exports[`<LabelNameInput /> matches snapshot 1`] = `
       "multiValueRemove": [Function],
       "option": [Function],
       "valueContainer": [Function],
-      "valueLabel": [Function],
     }
   }
 />

ui/src/Components/SilenceModal/__snapshots__/LabelValueInput.test.js.snap

@@ -30,7 +30,6 @@ exports[`<LabelValueInput /> matches snapshot 1`] = `
       "multiValueRemove": [Function],
       "option": [Function],
       "valueContainer": [Function],
-      "valueLabel": [Function],
     }
   }
 />