Add a space to log line

Irrationally annoyed by this when reading bugreports.

Change-Id: I71aaf53de011a206dc5fd8c6af00567d69e62fa8
Test: N/A (format fix)
Fix: 292525728

services/core/java/com/android/server/display/brightness/DisplayBrightnessStrategySelector.java

@@ -119,7 +119,7 @@ public class DisplayBrightnessStrategySelector {
         if (!mOldBrightnessStrategyName.equals(displayBrightnessStrategy.getName())) {
             Slog.i(TAG,
                     "Changing the DisplayBrightnessStrategy from " + mOldBrightnessStrategyName
-                            + " to" + displayBrightnessStrategy.getName() + " for display "
+                            + " to " + displayBrightnessStrategy.getName() + " for display "
                             + mDisplayId);
             mOldBrightnessStrategyName = displayBrightnessStrategy.getName();
         }